Port in western France (5)
I believe the answer is:
brest
'port in western france' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for brest that I've seen before include "French port" , "French Atlantic naval base" , "French warships here in Brittany" , "Port in Brittany" , "Breton port" .)