Two teas primarily used by country houses (8)
I believe the answer is:
chateaus
'houses' is the definition.
(chateau is a kind of house)
'two teas primarily used by country' is the wordplay.
'two teas' means two replacements for 'tea'.
'tea' becomes 'cha' (cha is a type of tea).
'primarily' means one lot of letters go next to another.
'used by' is a charade indicator (letters next to each other).
'country' becomes 'US' (United States).
'tea' after 'cha' is 'chatea'.
'chatea'+'us'='CHATEAUS'
(Another definition for chateaus that I've seen is " castles".)