Crossword Genius

Scare word (3)

Ross

I believe the answer is:

'scare word' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for boo that I've seen before include "Exclamation to startle" , "Shout of disapproval, maybe at ref" , "Negative reaction" , "Expression of disapproval" , "Cry of disapproval as at villain" .)

I've seen this clue in The New York Times.
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