Crossword Genius

Start of a library conversation, maybe (4)

Ross

I believe the answer is:

psst

(Other definitions for psst that I've seen before include "Pay attention" , "Sibilant sound made to attract attention" , "Sibilant interjection to call attention" , "Whispered exclamation to attract attention" , "Sound used to attract someone's attention" .)

I've seen this clue in the LA Times.
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