Related Clues:

• Thinker's output
• Its icon is a light bulb
• Creative contribution
• ''You have no ___!''
• Theory's start
• Potential dilemma solver
• It's out of one's mind
• Block buster?
• "I've got an __!"
• Light bulb, in the comics
• It may be big
• Genesis of a plan
• Think tank matter
• ---
• Inventor's brainchild