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.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.