Crossword Genius

Arena arbiter (3)

Ross

I believe the answer is:

ref

(Other definitions for ref that I've seen before include "Whistleblower (abbr)" , "'Game judge, in short (3)'" , "Football official (colloq.)" , "In brief, he controls a soccer match" , "One traditionally in black" .)

I've seen this clue in the Universal and the King Feature Syndicate.
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