Related Clues:
- Bop on the bean
- Word that can precede the starts of 17-, 35- and 54-Across and 16-Down
- Scarecrow's wish in 'The Wizard of Oz'
- Whack on the head
- Clever person
- Very intelligent person
- Computer's center, informally
- Hippocampus setting
- Cranium contents
- Major processing center
- Bird _____
- Whiz kid
- Organ
- With 25-Across, a puzzle
- Scarecrow's lack