Country and Western drinks (5)
I believe the answer is:
'country' is the definition.
(country of the UK)
'western drinks' is the wordplay.
'western' becomes 'w'.
'drinks' becomes 'ales' (ale is a kind of drink).
'and' is the link.
(Other definitions for wales that I've seen before include "UK country" , "Former principality" , "Cymru" , "Part of 1" , "Part of Great Britain" .)