Crossword Genius

Ass sound (4)

Ross

I believe the answer is:

bray

(Other definitions for bray that I've seen before include "Proclaim loudly" , "Donkey's call; its vicar trimmed" , "Harsh cry" , "Berkshire village with a 16th-century vicar celebrated in legend and song" , "time-serving vicar's parish" .)

I've seen this clue in The Guardian.
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