Capital of the Brittany region (6)
I believe the answer is:
rennes
'capital of the brittany region' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rennes that I've seen before include "Hurries" , "Major town in Brittany" , "City of Brittany" , "City of NW France" , "French city" .)