Crossword Genius

Ghostly sound effect (4)

Ross

I believe the answer is:

moan

(Other definitions for moan that I've seen before include "Complain, groan" , "Whinge" , "Complain, grumble" , "Lament; grumble" , "Murmur of pain; grumble" .)

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