Drink? Bar in Montenegro, perhaps (4)
I believe the answer is:
port
'drink?' is the definition.
(port is a kind of drink)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for port that I've seen before include "Dessert wine" , "Popular after dinner liqueur" , "Harbour; alcoholic drink" , "where one would expect water" , "'Any . . . . In a storm'" .)