Might complicate things, perhaps, for Breton leader on the French coast (8)
I believe the answer is:
obstacle
'leader on the french coast' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for obstacle that I've seen before include "race" , "Hurdle, impediment" , "hold-up" , "Barrier or deterrent" , "Blockage, hindrance" .)