Large French country house or castle (7)
I believe the answer is:
chateau
I believe this clue is a double definition.
'large french country house' is the first definition.
(I've seen this before)
'castle' is the second definition.
(I know that castle can be written as chateau)
(Other definitions for chateau that I've seen before include "country house in Bordeaux?" , "French palace" , "Castle (1)" , "Vineyard estate around Bordeaux" , "Castle, especially in France" .)