Referring Clues

• Sound of a cat or engine
• Tabby talk
• Manx "Thanks!"
• Persian output
• Sound of a fine-tuned engine
• Sound of a tuned engine
• "I'm happy" in Siamese?
• Engine sound
• Sound of contentment
• Run smoothly
• Good engine sound
• Petted pet's sound
• Say coquettishly
• Sound from a Burmese
• Contented sound
• Run perfectly
• What gentle strokes may produce
• Sound from a sex kitten?
• Sign of a contented cat
• Copy cats?
• Show contentedness, perhaps
• Contented kitty's sound
• Siamese sound of contentment
• Sound from a Siamese
• Sound from an Abyssinian
• Feline hum
• Happy cat's sound
• Sound of pleasure
• Siamese for "Aah!"?
• Siamese for "Ni-i-ice!"?
• Rumble in the jungle?
• Run like a dream
• Sound from a cuddled kitty
• Contented kitten's sound
• Relaxed sound
• Run softly
• Be catty
• Sound smooth
• Run really well
• Contented cat sound
• Contented cat's sound
• Run great
• Contented tabby sound
• Siamese sound
• Run like a charm, as an engine
• Cat or engine sound
• Feline "I feel fine"
• Hum
• Manx murmur
• Catnap noise
• Smooth sound
• Cat's murmur
• Persian sound
• Sound from Catwoman
• Smooth-running engine sound
• Music to a cat lover's ears
• Rumble of cats
• Happy rumble
• Sound engine sound
• Sound from a contented cat
• Siamese sign of contentment
• Sound of a contented cat
• Run well
• Siamese response
• Make a catty remark?
• Make a catty remark
• "I'm happy" in the siamese
• Kitten's sound
• Kitten's call
• Engine noise
• Desirable engine sound
• Contentment sound
• Kitten's comment
• Kitten noise
• Cat noise
• Copy a kitty
• Run well, as an engine
• Say sexily
• Run smoothly, as an engine
• Kittenish sound
• Sound of a content cat
• Kitty croon
• Run like a top
• Sound of a happy engine
• Sound finely tuned
• Kitten sound
• "That feels good" in Siamese?
• Result of some heavy petting?
• Happy Himalayan's rumble
• Sound from a contented kitty
• Well-tuned engine sound
• Feline sound
• Kitty's satisfied sound
• Sign of feline felicity
• Himalayan production
• Sound from a sphynx
• Cat sound found in the answer at 17-Across
• Sound like a well-tuned engine
• What cats and some engines do
• Motor sound
• Cat's rumble
• Sound of a finely tuned engine
• Respond to a belly rub, say
• Contentment indicator
• Cat sound
• Contented kitty sound
• Sound of satisfaction
• What you want your engine to do
• Smooth engine sound
• Sound of a contented kitty
• Emulate a happy cat
• Kitty's feedback
• Catty comment?
• Sound of a happy feline
• Sound of a satisfied Siamese
• Sound of a happy cat
• Sound of a Maltese or motor
• Emulate a contented cat
• Sound of a well-tuned engine
• Be catty?
• Persian murmur
• Sound from a contented Siamese
• Kitty's sound
• Kitty sigh
• Happy cat sound
• Noise a happy cat makes
• Happy cats do it
• "That feels good," to a tabby
• Sound from a happy cat
• Cat's sound
• Cat's contented sound
• Soft sound from car or cat
• Turn up car engine noise
• Sound content to reverse some of the corruption
• Sound of cat (or engine)
• Sound like a cat
• Turned up by car - you can just hear the engine
• Sound pleased, turning up with a posh car
• Sound of a contented feline
• Sound of happy cat
• Sound of the engine when you turn up with a posh car
• Sound of happy animal
• Sound of a happy mog
• Sound of cat
• Contented sound of cat
• Each sound is a sound of contentment
• 4's sound
• A stroke of the cat may produce it
• Sound from a Jaguar engine, but not a jaguar
• Backing up, luxury car makes vibrating sound
• Engine sound (but not when 7!)
• Noise of a contented feline
• Sound pleased
• Pulled up car making low vibrant sound
• Turn up with a growl, yet seem pleased
• Cat's utterance
• Feline murmur
• Sound from a kitten
• Good sound at the garage
• What engines can do
• Turn up with a growl - a beastly noise?
• Contented cat noise
• Cornish Rex's sound
• Content cat sound
• Abyssinian's sound
• Sound of a contented Siamese
• Contented murmur
• Pet's contented sound
• Sound from a lynx's larynx
• A catty thing to do
• Engine sound of the backup car?
• Hum, as an engine
• Happy kitty sound
• Reaction to scritches, maybe
• Contented pet's sound
• Sound of feline bliss
• Sound of feline felicity
• Sound from a cat or an engine
• Sign of cat love
• Feline sigh
• Seem pleased, yet turn up with a growl
• Indication of contentment
• Sound from 13-Across
• Sound of a Siamese
• Sound happy turning up with a posh car
• Happy Himalayan's sound
• Speak softly with contentment
• Car or cat sound
• "I am VERY happy you gave me this catnip"
• Contented rumble
• Sound catty?
• Garage mechanic's goal, maybe
• Sound of a Jaguar
• Cat's sound of self-relaxation
• [I'm a happy cat]
• Ideal engine sound
• Happy tabby's sound
• Happy cats do this
• Sound of feline contentment
• Sound of a happy tabby
• Feline rumble
• Cat sigh
• "Meow" relative
• Sound of a cat's joy
• Pleased cat's sound
• Sound from a pleased kitty
• Sound way to back up a car
• Sound of a smooth-running engine
• Content cat's sound
• [Keep scritching my head]