Crossword Genius

"Hey, you!" quietly (4)

Ross

I believe the answer is:

psst

(Other definitions for psst that I've seen before include "Sibilant whisper to attract attention" , "attempt to make secret contact" , "Pay attention" , "that attracts attention" , "Sibilant sound to get someone's attention" .)

I've seen this clue in the USA Today.
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