Britain's first bounder had this accent! (6)
I believe the answer is:
brogue
'this accent' is the definition.
(brogue can mean a Scottish or Irish accent)
'britain's first bounder' is the wordplay.
I cannot quite understand how this works, but
'first bounder' could be 'b' (1st letter of 'bounder') and 'b' is found in the answer.
The remaining letters 'rogue' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'had' is the link.
Can you help me to learn more?
(Other definitions for brogue that I've seen before include "Strong outdoor shoe" , "What might identify an Irishman" , "Stout shoe - Irish accent" , "Kind of shoe" , "Patterned shoe, accent" .)