Fashion house, we hear? (6)
I believe the answer is:
manner
'fashion' is the definition.
('manner' can be a synonym of 'fashion')
'house we hear?' is the wordplay.
'house' becomes 'manor' (manor house is a kind of house).
'we hear?' shows a homophone (sound like).
'manor' is a homophone of 'MANNER'.
(Other definitions for manner that I've seen before include "Demeanour" , "Style, air" , "Way of acting or behaving" , "Fashion, way" , "Way or means" .)