Related Clues:
- Olympics participant
- N.B.A. official
- Official with a whistle
- Caller of 39-Across
- Court judge
- He rules over balls
- Whistling zebra?
- One who might call holding
- Two-minute warning giver
- "Offside" official, for short
- He may OK a KO
- Arbiter with a whistle
- B-ball arbitrator
- One who may OK a KO
- Whistle blower, in basketball