Ray drunk on port (3)
I believe the answer is:
ayr
'port' is the definition.
(I've seen this before)
'ray drunk' is the wordplay.
'drunk' indicates anagramming the letters.
'ray' with letters rearranged gives 'AYR'.
'on' is the link.
(Other definitions for ayr that I've seen before include "Town on Firth of Clyde" , "Scottish seaport" , "Scots port on Firth of Clyde" , "Scottish salmon river" , "Scottish town sounds tuneful" .)