Related Clues:
- Officiate a lacrosse game
- NLL official
- One calling a 'T'
- Expert with flags, perhaps
- WNBA arbiter
- Celtics game official
- Caller of fouls
- Soccer card holder
- Certain whistle-blower
- Rugby official
- Soccer official, informally
- Whistle blower, briefly
- The one who ensures fair play
- Whistle-blower hiding up in safe room
- Sporting man in black?