Crossword Genius

"Hey," in the library (4)

Ross

I believe the answer is:

psst

(Other definitions for psst that I've seen before include "It's said to draw attention" , "Attention-seeking noise" , "Whispered attention grabber" , "Hissing noise to attract attention" , "Sibilant sound to attract attention furtively" .)

I've seen this clue in the Universal.
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