Crossword Genius

Furtive "Hey!" (4)

Ross

I believe the answer is:

psst

(Other definitions for psst that I've seen before include "Hissing noise to attract attention" , "way of attracting attention" , "Quiet attention-seeker" , "attempt to make secret contact" , "that attracts attention" .)

I've seen this clue in the Universal, the LA Times and the Newsday.
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