Go-between — a pukka fellow! (5)

I believe the answer is:

agent

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'go-between' is the definition.
(I've seen this before)

'a pukka fellow' is the wordplay.
'pukka fellow' becomes 'gent' (synonyms. I am not sure about the 'pukka' bit.).
'a'+'gent'='AGENT'

Can you help me to learn more?

(Other definitions for agent that I've seen before include "Business manager" , "Sales rep" , "Spy - broker" , "Dealer" , "Person acting on behalf of another" .)

I've seen this clue in The Times.

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