Crossword Genius

Alternative to a finger poke (4)

Ross

I believe the answer is:

psst

(Other definitions for psst that I've seen before include "Surreptitious attention-seeker" , "attempt to make secret contact" , "Sibilant sound made to attract attention" , "Sibilant interjection to call attention" , "This is confidential" .)

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