Related Clues:

• Plan of action
• Lightbulb, in toons
• Light bulb for Wile E. Coyote?
• Lightbulb, in comics
• Revelation
• 'Any ___?'
• It's a thought
• It may be bright or novel
• Conceit
• Inventor's starting point
• ''Why, the very ---!''
• It's all in your mind
• Bee Gees album title
• Inventor's need
• Hypothesis