Noted national property (6)
I believe the answer is:
estate
'property' is the definition.
(estate is a kind of property)
'noted national' is the wordplay.
'noted' becomes 'e' (I can't justify this - if you can you should give a lot more credence to this answer).
'national' becomes 'state' (national can mean state-owned).
'e'+'state'='ESTATE'
Can you help me to learn more?
(Other definitions for estate that I've seen before include "All of one's assets and liabilities" , "Possessions at the time of death" , "Car; landed property" , "Area of landed property" , "Property with large grounds" .)