Related Clues:
- It's out of one's mind
- Block buster?
- "I've got an __!"
- They're out of your mind
- Light bulb, in the comics
- It may be big
- Genesis of a plan
- Think tank matter
- Word substituted FOR the last word of 75-Across
- ---
- Inventor's brainchild
- Mental creation
- They may be funny or bright
- Suggestion box contents
- Thought hidden in eight long puzzle answers