State ownership! (5)
I believe the answer is:
claim
This might be a double definition.
'state' is the first definition.
(thesaurus)
'ownership' is the second definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for claim that I've seen before include "Assert; request" , "Put in for" , "title" , "Assert; demand" , "Take" .)