Related Clues:

• 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
• ''I had no __!''
• Hunch, say
• A lightbulb can represent it
• Gray matter matter