Crossword Genius

Discreet "Hey!" (4)

Ross

I believe the answer is:

psst

(Other definitions for psst that I've seen before include "Sound to call quietly" , "Don't tell anyone" , "Whispered exclamation to attract attention" , "Here's a secret" , "Sibilant sound to attract attention furtively" .)

I've seen this clue in The Washington Post.
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