Related Clues:

• Invention inception
• Gray matter
• The start of an invention
• Kidney, e.g.
• Noodle concoction?
• Suspicion
• Bit of inspiration
• Wax, for one
• Light bulb, to Edison and comics
• Aftermath of a brainstorm
• Big or bright thing
• Part of the brain
• Green or coffee
• Vanilla, for one
• Brilliant thought