Ignore ruined area (6)
I believe the answer is:
region
'area' is the definition.
(I know that area can be written as region)
'ignore ruined' is the wordplay.
'ruined' indicates an anagram.
'ignore' is an anagram of 'REGION'.
(Other definitions for region that I've seen before include "Area,territory" , "Area having definable character" , "Part of a country" , "Ignore (anag) -- expanse of land" , "Area - district" .)