Servant is brought up working in large house (7)
I believe the answer is:
mansion
'large house' is the definition.
(I've seen this before)
'servant is brought up working' is the wordplay.
'servant' becomes 'man' (man is a kind of servant).
'brought up' shows that the letters should be reversed in order (down clues only).
'working' becomes 'on'.
'is' back-to-front is 'si'.
'man'+'si'+'on'='MANSION'
'in' is the link.
(Other definitions for mansion that I've seen before include "Big house" , "Grand house" , "Handsome house as for Lord Mayor" , "Huge abode" , "Imposing house" .)