Belonging to them (5)
'belonging to them' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for their that I've seen before include "Possessive pronoun" , "belonging to an individual" , "Some would say his (or her)" , "Belonging to those people" , "Belonging to him (perhaps wrongly)" .)
'belonging to them' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for theirs that I've seen before include "Belonging to those people" , "Owned by them" .)