Crossword Genius

Interjection used to surreptitiously attract someone's attention (4)

Ross

I believe the answer is:

psst

(Other definitions for psst that I've seen before include "Sibilant interjection to call attention" , "Notice me" , "Listen!" , "Sibilant whisper to attract attention" , "attempt to attract attention" .)

I've seen this clue in The Times.
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