Crossword Genius

Ghost's cry (3)

Ross

I believe the answer is:

boo

'ghost's cry' 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 "Disapproving sound" , "A shocking exclamation!" , "Cry of contempt" , "Shout of disapproval, maybe at ref" , "I hated that!" .)

I've seen this clue in The Star Tribune and the Universal.
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