Dismiss the fellows - they can go to blazes! (7)

I believe the answer is:

firemen

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'they can go to blazes' is the definition.
The definition suggests an adverb but the answer is not.

'dismiss the fellows' is the wordplay.
'dismiss' becomes 'fire' (synonyms).
'the fellows' becomes 'men' (fellow can mean a man).
'fire'+'men'='FIREMEN'

Can you help me to learn more?

(Other definitions for firemen that I've seen before include "They fight conflagrations" , "Stokers" , "Hose wielder" , "Their job is to extinguish conflagrations" .)

I've seen this clue in the Evening Standard.

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