Fashion house given mention (6)
I believe the answer is:
manner
'fashion' is the definition.
(I know that fashion can be written as manner)
'house given mention' is the wordplay.
'house' becomes 'manor' (manor house is a kind of house).
'given mention' shows a homophone (sound like).
'manor' is a homophone of 'MANNER'.
(Other definitions for manner that I've seen before include "Person's bearing or way of behaving" , "Deportment or method" , "Mode" , "How something is said or done" , "Bearing - fashion" .)