Later on interrupted by large blast of hot air (6)
I believe the answer is:
bellow
'blast of hot air' is the definition.
'bellow' can be an answer for 'blast' (thesaurus). I am not certain of the 'of hot air' bit.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for bellow that I've seen before include "Loud and deep roar" , "Yell" , "Deep roar as of bull" , "Roar like a bull" , "Loud cry of a bull" .)