Crossword Genius

Sound made by a sneaker, say? (4)

Ross

I believe the answer is:

psst

(Other definitions for psst that I've seen before include "Beckoning sound" , "This is confidential" , "Sibilant whisper to attract attention" , "It's said to draw attention" , "Hissing noise to attract attention" .)

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