Junior doctor for Bury and Wigan at last (6)
I believe the answer is:
intern
'junior doctor' is the definition.
(term for a student doctor)
'bury and wigan at last' is the wordplay.
'bury' becomes 'inter' (synonyms).
'and' is a charade indicator (letters next to each other).
'at last' indicates one should take the final letters.
The last letter of 'wigan' is 'n'.
'inter'+'n'='INTERN'
'for' is the link.
(Other definitions for intern that I've seen before include "cage" , "(American) hospital doctor" , "Often unpaid trainee" , "Hold in custody" , "Shut up" .)