Crossword Genius

One may cry foul (3)

Ross

I believe the answer is:

ref

(Other definitions for ref that I've seen before include "Football's whistler" , "Sports umpire" , "In brief, he controls a soccer match" , "Whistleblower (abbr)" , "A diminutive umpire in soccer or boxing" .)

I've seen this clue in The New York Times.
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