Related Clues

• Use your brain
• Reflect
• Use one's bean
• "Concentrate!"
• Get lost in a brown study
• End of the observation
• Something to do twice?
• "Use your head!"
• 47 Down motto
• Reason
• Deliberate
• Use one's head
• Cogitate
• Use your head
• Cerebrate
• Opine
• Get ideas
• 1968 hit for 42-Across
• Use one's gray cells
• Ponder