Crossword Genius

Horse laugh (6)

Ross

I believe the answer is:

guffaw

(Other definitions for guffaw that I've seen before include "A coarse noisy laugh" , "Roar of laughter" , "A loud raucous laugh" , "Belly laugh" , "A loud uninhibited laugh" .)

I've seen this clue in the Evening Standard and the Newsday.
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