Crossword Genius

Covert convo start (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" , "It's said to draw attention" , "Beckoning sound" , "Notice me" , "Noise used to attract someone's attention privately" .)

I've seen this clue in the LA Times.
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