Crossword Genius

"Hey you!" whisper (4)

Ross

I believe the answer is:

psst

(Other definitions for psst that I've seen before include "Attention-seeking noise" , "Interjection to draw attention" , "Here's a secret" , "Sibilant whisper to attract attention" , "Quiet call for attention" .)

I've seen this clue in the USA Today and the Newsday.
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