Crossword Genius

Expert with flags, perhaps (3)

Ross

I believe the answer is:

ref

(Other definitions for ref that I've seen before include "Whistleblower (abbr)" , "Middleman needing cards" , "'Game judge, in short (3)'" , "Sports official (abbrev.)" , "Football's whistler" .)

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