Related Clues:

• The light bulb, to Edison
• "The very ___!"
• Flash of brilliance
• Postulation
• Creative thought
• It may be seminal
• Thesis basis
• Fanciful notion
• Brainstorming session result
• Bean concoction?
• "Ah-ha" predecessor
• Approximation
• Creative germ
• It may come to mind
• What comes to mind