Stoker's anger minutes after breaking cooling device (7)
I believe the answer is:
fireman
'stoker's' is the definition.
(synonyms)
'anger minutes after breaking cooling device' is the wordplay.
'anger' becomes 'ire' (ire is intense rage).
'minutes' becomes 'm' (common abbreviation).
'after' is a charade indicator (letters next to each other).
'breaking' means one lot of letters goes inside another.
'cooling device' becomes 'fan' (I've seen this before).
'ire'+'m'='irem'
'irem' inserted within 'fan' is 'FIREMAN'.
(Other definitions for fireman that I've seen before include "Red engine driver" , "Fighter of blaze" , "Railway driver's assistant" , "Chap with a ladder and hose" , "he puts out at work" .)