Related Clues:
- Four of diamonds, for short?
- They call 'em as they see 'em
- Diamond specialists?
- Little League refs
- Baseball refs
- Baseball figures wearing masks
- Work-from-home types
- Diamond authorities
- Calls balls, say
- "Catcher interference" callers
- Diamond appraisers?
- Professionals who work from home about a quarter of the time?
- Some park workers
- Pros who cry "out" loud?