Crossword Genius

Yellow card issuer (3)

Ross

I believe the answer is:

ref

'yellow card issuer' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ref that I've seen before include "Middleman needing cards" , "Sports umpire" , "One traditionally in black" , "Football's whistler" , "In brief, a soccer controller" .)

I've seen this clue in the New York Times and the Wall Street Journal.
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