Possessors (6)
I believe the answer is:
owners
'possessors' is the definition.
('owner' can be a synonym of 'possessor')
This is all the clue.
(Other definitions for owners that I've seen before include "Those in lawful possession, as of house" , "Worsen for possessors" , "Proprietors" , "Legal possessors" , "Holders, possessors" .)