Laugh producing hot air? Shame (6)

I believe the answer is:

guffaw

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'laugh' is the definition.
(guffawing is a kind of laughing)

I don't understand the remainder of the clue.

(Other definitions for guffaw that I've seen before include "A loud hearty laugh" , "Laugh loudly" , "way of expressing amusement" , "A loud uninhibited laugh" , "A coarse noisy laugh" .)

I've seen this clue in The Times and The Sunday Times.

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