Whiskey or port? (3)
I believe the answer is:
rye
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)
'or' acts as a link.
(Other definitions for rye that I've seen before include "Grain crop" , "E. Sussex town; cereal" , "Wheat-like cereal plant" , "Cereal grain" , "American whisky" .)