The left-hand side of a ship (4)
I believe the answer is:
port
'the left-hand side of a ship' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for port that I've seen before include "Rotterdam, e.g." , "Drink passed to the left" , "Dessert wine" , "Stanley perhaps" , "Grimsby, perhaps" .)