Style of large house spoken of (6)
I believe the answer is:
manner
'style' is the definition.
('manner' can be a synonym of 'style')
'large house spoken of' is the wordplay.
'large house' becomes 'manor' (I've seen this before).
'spoken of' indicates a 'sounds like' (homophone) clue.
'manor' is a homophone of 'MANNER'.
'of' is the link.
(Other definitions for manner that I've seen before include "How something is said or done" , "Bearing - fashion" , "Way of doing something, or general attitude" , "Fashion, style" , "Style, way" .)