Related Clues:
- Men in black, usually
- Calls balls and strikes, briefly
- Solitaire statistic
- Diamond measures
- Works at home?
- Balls-and-strikes callers
- Play watchers?
- Ring figures?
- Stone weights
- ''No catch'' signalers
- Tennis arbiters
- Subject of a familiar law
- Officials who cry 'Yer out!'
- They're usually assigned to bases
- Jewelry units