Crossword Genius

Remark to attract attention (4)

Ross

I believe the answer is:

psst

(Other definitions for psst that I've seen before include "Sibilant sound made to attract attention" , "Sound to call quietly" , "Whispered exclamation to attract attention" , "Interjection to attract someone's attention without alerting others" , "Hissing noise to attract attention" .)

I've seen this clue in The Guardian.
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