A brief dirge composed for Trumpton's brass band (4,7)

I believe the answer is:

fire brigade

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'trumpton's brass band' is the definition.
I can't judge whether this defines the answer.

'a brief dirge composed' is the wordplay.
'composed' indicates anagramming the letters.
'a'+'brief'+'dirge'='abriefdirge'
'abriefdirge' is an anagram of 'FIRE-BRIGADE'.

'for' is the link.

Can you help me to learn more?

(Other definitions for fire brigade that I've seen before include "rescuers" , "Organised group to combat conflagrations" , "9a 19d" , "Blaze tacklers" .)

I've seen this clue in The Independent.

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