Rewritten clarifications remove friction in French port (6)
I believe the answer is:
calais
'french port' is the definition.
(Calais is a port in France)
'rewritten clarifications remove friction' is the wordplay.
'rewritten' indicates an anagram.
'remove' suggests deleting specific letters.
'clarifications' with 'friction' taken away is 'lacais'.
'lacais' is an anagram of 'CALAIS'.
'in' is the link.
(Other definitions for calais that I've seen before include "French port opposite Dover" , "Nearest French port to England" , "French Channel port" , "end of the tunnel" , "A ferry port in northern France" .)