Crossword Genius

Interjection that might serve as a mild warning (4)

Ross

I believe the answer is:

ahem

(Other definitions for ahem that I've seen before include "Sound made when clearing throat" , "I say!" , "request for attention" , "Polite noise to draw attention" , "Utterance of mild disapproval" .)

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