Crossword Genius

Whispered call for attention (4)

Ross

I believe the answer is:

psst

(Other definitions for psst that I've seen before include "Quiet call for attention" , "Notice me" , "Sibilant interjection to call attention" , "(Whispered) may I have your attention?" , "Don't tell anyone" .)

I've seen this clue in the Newsday and the Universal.
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