Related Clues:
- Productive thought
- One may be big or bright
- ''The very ___!'' (''What nerve!'')
- Light bulb, to a toon
- 'No ___' ('Beats me')
- Invention impetus
- "The very" thing
- 'What's the big ___?'
- It may be preconceived
- Gray matter matter?
- It may be bright
- Coconut yield?
- Think-tank nugget
- "I have an __!"
- Head start?