Crossword Genius

Whistle blower in sports (3)

Ross

I believe the answer is:

ref

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

I've seen this clue in the Universal.
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