Old Italian manor destroyed (5)
I believe the answer is:
roman
'old italian' is the definition.
(I've seen this before)
'manor destroyed' is the wordplay.
'destroyed' is an anagram indicator.
'manor' with letters rearranged gives 'ROMAN'.
(Other definitions for roman that I've seen before include "Norma (anag) -- upright style of print" , "Italian person" , "Plain upright print style" , "From Italy's capital" , "Non-italic (type)" .)