One belongs to a society (6)
I believe the answer is:
member
'one belongs to a society' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for member that I've seen before include "As an example, arm" , "Part of body or club associate" , "Part of body or one of a group" , "Person in an organised group" , "Limb - affiliate" .)