Charming man, spy needing no introduction (4)
I believe the answer is:
gent
'charming man' is the definition.
'gent' can be an answer for 'man' (gent is a kind of man). I'm unsure of the 'charming' bit.
'spy needing no introduction' is the wordplay.
'spy' becomes 'agent' (I've seen this before).
'needing no introduction' means to remove the first letter.
'agent' with its first letter taken off is 'GENT'.
Can you help me to learn more?
(Other definitions for gent that I've seen before include "Auctioneer's tool" , "Man of good standing (informal)" , "Honourable man" , "Chap, fellow" , "bloke" .)