Crossword Genius

"Get off the stage!” (3)

Ross

I believe the answer is:

boo

(Other definitions for boo that I've seen before include "Show displeasure orally" , "Make one's dislike heard" , "Exclamation to startle" , "Shout of disapproval, maybe at ref" , "Expression of disapproval" .)

I've seen this clue in The Wall Street Journal.
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