Crossword Genius

Secret indication (4)

Ross

I believe the answer is:

psst

(Other definitions for psst that I've seen before include "Noise used to attract someone's attention privately" , "Sibilant interjection to call attention" , "Soft sound to get someone's attention" , "Hissing noise to attract attention" , "Sound of call to hear a secret" .)

I've seen this clue in The New York Times.
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