Banks on finishing late in bars, drunk (5)
I believe the answer is:
braes
'banks' is the definition.
(I've seen this before)
'finishing late in bars drunk' is the wordplay.
'finishing' indicates one should take the final letters (the letter which finishes the word).
'in' is an insertion indicator.
'drunk' is an anagram indicator.
The final letter of 'late' is 'e'.
'bars' with letters rearranged gives 'bras'.
'e' going inside 'bras' is 'BRAES'.
'on' is the link.
(Other definitions for braes that I've seen before include "Old song 'By yon bonny banks, and by yon bonny . . . . .'" , "Scottish hillsides, banks" , "Sabre (anag) - Scottish banks" , "Hillsides in Scotland" .)