Related Clues:

• Project's basis
• It might just come to you
• In the end, Russell returns to papers with proposal
• Think tank's quest
• It might pop into your head
• Skull session result
• Coconut product?
• Black cloud : anger :: light bulb : __
• Brainy creation
• Inventor's brilliant notion
• Bit of brainwork
• Mental spark
• Light in the attic?
• Creative morsel
• Perfect short clue