Long to take Oxford course in French port (6)
I believe the answer is:
dieppe
'french port' is the definition.
(I've seen this before)
'long to take oxford course' is the wordplay.
'long' becomes 'die' (to long for or to die for something is to crave it).
'to take' means one lot of letters go next to another.
'oxford course' becomes 'PPE' (Philosophy, Politics and Economics degree).
'die'+'ppe'='DIEPPE'
'in' acts as a link.
(Other definitions for dieppe that I've seen before include "Channel port in northern France" , "Port of N. France" , "French town" , "French port opposite Kent" , "French English channel port" .)