Belonging to those people in that place, we hear (5)
I believe the answer is:
their
'belonging to those people' is the definition.
(I've seen this before)
'that place we hear' is the wordplay.
'that place' becomes 'there' (I've seen this before).
'we hear' shows a homophone (sound like).
'there' is a homophone of 'THEIR'.
'in' acts as a link.
(Other definitions for their that I've seen before include "Belonging to those people" , "Belonging to him (perhaps wrongly)" , "Those people's" , "Relating to them" , "Some would say his (or her)" .)