Belly laugh (4)
'belly laugh' is the definition.
(I know that belly laugh can be written as guffaw)
This is the entire clue.
(Other definitions for guffaw that I've seen before include "A coarse noisy laugh" , "Roar of laughter" , "A loud vulgar laugh" , "Belly laugh" , "Crude and boisterous laugh" .)
'belly laugh' is the definition.
(roaring laughter)
This is all the clue.
(Other definitions for roar that I've seen before include "Bawl, bellow" , "Lion's call" , "Deep-throated cry" , "Great cry" , "Yell" .)