Quit port (4)
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I believe the answer is:
left
I believe this clue is a double definition.
'quit' is the first definition.
(I've seen this before)
'port' is the second definition.
(port is the left side on a boat)
(Other definitions for left that I've seen before include "Vacated; political wing" , "Possibly radical" , "Sailed from" , "inclined towards socialism" , "The sinister side" .)