Crossword Genius

Sibilant summons (4)

Ross

I believe the answer is:

psst

'sibilant summons' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for psst that I've seen before include "(Whispered) may I have your attention?" , "Sound used to attract someone's attention" , "Noise used to attract someone's attention privately" , "Call to attract attention" , "Sibilant sound to get someone's attention" .)

I've seen this clue in the King Feature Syndicate, the Penny Press, The Wall Street Journal and The New York Times.
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