Related Clues:
- Blue-clad judges
- Men in black, usually
- Calls balls and strikes, briefly
- Works at home?
- Balls-and-strikes callers
- Play watchers?
- Makers of many calls
- ''No catch'' signalers
- Tennis arbiters
- Officials who cry 'Yer out!'
- They're usually assigned to bases
- Diamond group
- Tennis judges
- You might be safe with them
- Home workers