Old Italian destroyed manor (5)
I believe the answer is:
roman
'old italian' is the definition.
(I've seen this before)
'destroyed manor' is the wordplay.
'destroyed' indicates an anagram.
'manor' with letters rearranged gives 'ROMAN'.
(Other definitions for roman that I've seen before include "Caesar, for instance" , "Citizen of Italian capital" , "Upright form of type" , "Ancient Italian" , "Italian person" .)