Eastern country's landed property (6)
I believe the answer is:
estate
'landed property' is the definition.
(I've seen this before)
'eastern country's' is the wordplay.
'eastern' becomes 'e'.
'country' becomes 'state' ('state' can be a synonym of 'country').
'e'+'state'='ESTATE'
(Other definitions for estate that I've seen before include "park perhaps" , "Property with considerable land" , "Property - may go with rank" , "The whole of a deceased person's assets" , "Rank - housing development - car" .)