Related Clues:
- It may be bright or big
- "An __ is salvation by imagination": Frank Lloyd Wright
- Creative output
- Step one of an invention
- Essential meaning
- Mental inspiration
- Cranial bulb?
- Lohengrin, for one
- Melchior, for one
- Caruso, notably
- Part of SATB
- "The very __!"
- Main meaning
- Cartoon light bulb
- 'You have no ___'