Crossword Genius

Unhappy spectator's shout (3)

Ross

I believe the answer is:

boo

(Other definitions for boo that I've seen before include "Catcall" , "Disapproving sound" , "Exclamation to startle" , "Frightening word (for a goose?)" , "I hated that!" .)

I've seen this clue in the Newsday.
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