Better to drink port bottled by that female Cockney (8)
I believe the answer is:
superior
'better' is the definition.
(I know that better can be written as superior)
'drink port bottled by that female cockney' is the wordplay.
'drink' becomes 'sup' (to sup is to drink).
'port' becomes 'rio' (Rio de Janeiro is a port).
'bottled by' is an insertion indicator (bottle can mean to contain).
'that female cockney' becomes ''er' ('her' - I've seen this in another clue - said with a cockney accent, dropping the 'H').
'rio' placed inside 'er' is 'erior'.
'sup'+'erior'='SUPERIOR'
'to' is the link.
(Other definitions for superior that I've seen before include "head of monastery" , "Snooty" , "Of greater rank or quality" , "Upper" , "World's largest freshwater lake" .)