Whiskey and port (3)
I believe the answer is:
rye
I believe this clue is a double definition.
'whiskey' is the first definition.
(rye whiskey is a type of whiskey)
'port' is the second definition.
(English town which was once a port)
'and' is the link.
(Other definitions for rye that I've seen before include "Cereal plant; whisky" , "E. Sussex town; cereal" , "American whisky" , "Grain used in flour and whiskey" , "Whisky; Sussex town" .)