Deserted port (4)
I believe the answer is:
left
I believe this is a double definition.
'deserted' is the first definition.
(I've seen this in another clue)
'port' is the second definition.
(port is the left side on a boat)
(Other definitions for left that I've seen before include "Possibly radical" , "political group" , "It's not right" , "Departed or bequeathed" , "The side of socialism" .)