Related Clues:
- It might be right or bright
- Something that can't be patented
- Inventor's inkling
- 'Drawing is putting a line round an ___': Henri Matisse
- English for 47 Across
- Toon light
- Sudden thought
- Dome light?
- Fully-grown germ?
- Creative starting point
- 'You have no ___!'
- Something to think up
- Like taffeta
- It can be big or harebrained
- [Lightbulb!]