Crossword Genius

Certain whistle-blower (3)

Ross

I believe the answer is:

ref

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

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