Right of possession (4)
'right of possession' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ownership that I've seen before include "Proprietorship, possession" , "Legal title" , "The right of possessing something" , "Proprietary right of possession" .)
(Other definitions for lien that I've seen before include "Security for a debt" , "Legal right over the Nile" , "The right to take property if an obligation is not discharged" , "Legal claim on Nile" , "Legal claim on the property of another" .)