Crossword Genius

"Hey, you there!" (4)

Ross

I believe the answer is:

psst

(Other definitions for psst that I've seen before include "Soft sound to get someone's attention" , "Whispered exclamation to attract attention" , "Surreptitious attention-seeker" , "Sound of call to hear a secret" , "Call to attract attention" .)

I've seen this clue in The New York Times and the Wall Street Journal.
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