Old Italian built manor (5)
I believe the answer is:
roman
'old italian' is the definition.
(I've seen this before)
'built manor' is the wordplay.
'built' is an anagram indicator (the same letters can be used to build the answer).
'manor' anagrammed gives 'ROMAN'.
(Other definitions for roman that I've seen before include "Norma (anag) -- upright style of print" , "ancient empire" , "Old Italian l" , "Denizen of the eternal city" , "- Empire; - nose" .)