Coarse laugh (6)
I believe the answer is:
guffaw
'coarse laugh' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for guffaw that I've seen before include "A loud uninhibited laugh" , "Burst of loud, hearty laughter" , "Belly laugh" , "coarse laughter" , "A loud hearty laugh" .)