Related Clues:
- Cause of an ''aha'' moment
- Brain output
- It might come off the top of your head
- Inventor's forte
- Brainy output
- Noodle output?
- Thinker's output
- Its icon is a light bulb
- Creative contribution
- ''You have no ___!''
- Inventor's germ
- Theory's start
- Potential dilemma solver
- It's out of one's mind
- Block buster?