He can go to blazes! (7)
I believe the answer is:
fireman
'he can go to blazes' is the definition.
(I've seen this in another clue)
'can go to blazes' is the wordplay.
'can' becomes 'fire' (I've seen this in another clue).
'go to' is a charade indicator (letters next to each other).
'blazes' becomes 'man' (I can't justify this - if you can you should give a lot more credence to this answer).
'fire'+'man'='FIREMAN'
Can you help me to learn more?
(Other definitions for fireman that I've seen before include "Rescue worker" , "Fighter of blaze" , "Chap with a ladder and hose" , "In frame (anag.)" , "Conflagration fighter" .)