Reconstructed Roman country house (5)
I believe the answer is:
manor
'country house' is the definition.
(I've seen this before)
'reconstructed roman' is the wordplay.
'reconstructed' indicates an anagram.
'roman' with letters rearranged gives 'MANOR'.
(Other definitions for manor that I've seen before include "Lord's estate" , "Police district (slang)" , "Landed estate" , "Roman (anag.)" , "patch" .)