Related Clues:

• It's a thought
• ''Don't get any funny ---!''
• It may be bright or novel
• Conceit
• Inventor's starting point
• Idea
• ''Why, the very ---!''
• It's all in your mind
• Bee Gees album title
• Inventor's need
• Hypothesis
• Brainstorming bit
• Cerebral creation
• Think tank output
• 'Gibraltar may be strong, but ___ are impregnable': Emerson