Crossword Genius

Loud laugh sound (6)

Ross

I believe the answer is:

heehaw

(Other definitions for heehaw that I've seen before include "Sound from the stable?" , "Laugh of a donkey" , "Donkey's cry" , "Cry of a mule" , "Written bray of a donkey" .)

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