Eastern country spy selling land not his own (6,5)
I believe the answer is:
estate agent
'selling land not his own' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'eastern country spy' is the wordplay.
'eastern' becomes 'e'.
'country' becomes 'state' ('state' can be a synonym of 'country').
'spy' becomes 'agent' (I've seen this before).
'e'+'state'+'agent'='ESTATE AGENT'
Can you help me to learn more?
(Other definitions for estate agent that I've seen before include "Man of property" , "Property dealer" , "House retailer" , "One selling houses" , "Property seller" .)