"Hey! Look this way!" (4)

I believe the answer is:

psst

(Other definitions for psst that I've seen before include "Sibilant sound to attract attention furtively" , "Sibilant sound to get someone's attention" , "Interjection to draw attention" , "Sibilant interjection to call attention" , "Interjection to attract someone's attention without alerting others" .)

I've seen this clue in The Washington Post.

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