Old Italian remodelled manor (5)
I believe the answer is:
roman
'old italian' is the definition.
(I've seen this before)
'remodelled manor' is the wordplay.
'remodelled' is an anagram indicator.
'manor' is an anagram of 'ROMAN'.
(Other definitions for roman that I've seen before include "From Italy's capital" , "Like the English alphabet" , "Locking device" , "eg Brutus" , "of foreign city" .)