Doesn't possibly make port! (6)
I believe the answer is:
ostend
'port' is the definition.
(I've seen this before)
'doesn't possibly' is the wordplay.
'possibly' indicates an anagram.
'doesnt' anagrammed gives 'OSTEND'.
'make' acts as a link.
(Other definitions for ostend that I've seen before include "Port - doesn't (anag)" , "cross-channel port" , "European port" , "Port in Belgium" , "Belgian port and resort" .)