Roman rebuilt house (5)
I believe the answer is:
manor
'house' is the definition.
(manor is a kind of house)
'roman rebuilt' is the wordplay.
'rebuilt' indicates an anagram.
'roman' anagrammed gives 'MANOR'.
(Other definitions for manor that I've seen before include "Nobleman's land" , "house on estate" , "Grand but strange Roman house" , "Lord's estate" , "Operational base" .)