Related Clues:

• 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
• Budding plan
• Writer's block buster
• Potential solution
• It may be fixed or bright
• Cerebral spark