Related Clues:

• Person who whistles
• Make calls
• Tennis official
• Striped official
• Authority on diamonds?
• Webster's or Bartlett's
• Zebra
• Make some calls
• One who cries foul?
• Ring leader?
• Gridiron official, for short
• Penalty declarer
• Blind official, in stereotypes
• Plate cleaner
• Striped whistle-blower