Representative needs no introduction, an honourable individual (4)
I believe the answer is:
gent
'honourable individual' is the definition.
'gent' can be an answer for 'individual' (gent is a kind of individual). I am not sure about the 'honourable' bit.
'representative needs no introduction' is the wordplay.
'representative' becomes 'agent' (agent is a kind of representative).
'needs no introduction' means to remove the first letter.
'agent' with its initial letter taken away is 'GENT'.
'an' acts as a link.
Can you help me to learn more?
(Other definitions for gent that I've seen before include "bloke" , "Man of good standing (informal)" , "Informal and short man" , "Toff" , "Refined man (colloquial)" .)