Wine left for sailors (4)
I believe the answer is:
port
I believe this is a double definition.
'wine' is the first definition.
(I know that Port is a type of Portuguese wine)
'left for sailors' is the second definition.
(term for the left of a ship)
(Other definitions for port that I've seen before include "where one would expect water" , "Larboard, formerly" , "After-dinner drink" , "Wine - left - harbour" , "Grimsby, perhaps" .)