Port or whiskey (3)
I believe the answer is:
rye
This clue is a double definition.
'port' is the first definition.
(English town which was once a port)
'whiskey' is the second definition.
(rye whiskey is a type of whiskey)
'or' is the link.
(Other definitions for rye that I've seen before include "Whisky; Sussex town" , "A Cinque Port; a grain" , "One of Cinque Ports" , "(Gypsy) gent; type of bread, whiskey" , "Grass; whisky" .)