French port is rather unsophisticated (6)
I believe the answer is:
gauche
I believe this clue is a double definition.
'french port' is the first definition.
(French for 'left', which is port on a ship)
'rather unsophisticated' is the second definition.
(gauche can mean awkward or unsophisticated)
'is' is the link.
(Other definitions for gauche that I've seen before include "'Ill-at-ease, awkward (6)'" , "Ill-at-ease, awkward in social situations" , "'Lacking social polish, awkward (6)'" , "inelegant" , "Awkward - ill-bred" .)