Wine left at sea (4)
I believe the answer is:
port
I believe this is a double definition.
'wine' is the first definition.
(port wine is a kind of wine)
'left at sea' is the second definition.
(I've seen this in another clue)
(Other definitions for port that I've seen before include "Sweet dark red fortified wine taken after meal" , "Drink - left at sea" , "Wine - shippers use it" , "'Any . . . . In a storm'" , "Bordeaux, say" .)