Related Clues:

• 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
• Whistle-blower hiding up in safe room
• Whistle-wearing official
• Illegal-motion caller
• One making calls, informally