They can go to blazes! (7)
I believe the answer is:
firemen
'they' is the definition.
Both the definition and answer are plural nouns.
Perhaps they are linked in a way I don't understand?
'can go to blazes' is the wordplay.
'can' becomes 'fire' (I've seen this in another clue).
'go to' says to put letters next to each other.
'blazes' becomes 'men' (I can't justify this - if you can you should believe this answer much more).
'fire'+'men'='FIREMEN'
Can you help me to learn more?
(Other definitions for firemen that I've seen before include "They fight conflagrations" , "Their job is to extinguish conflagrations" , "Hose wielder" , "Stokers" .)