Relatives from Northern Territory — in Australia! (5)
I believe the answer is:
aunts
'relatives' is the definition.
(aunt is a kind of relative)
'northern territory in australia' is the wordplay.
'northern territory' becomes 'nt'.
'in' is an insertion indicator.
'australia' becomes 'Aus' (abbreviation).
'nt' put inside 'aus' is 'AUNTS'.
'from' acts as a link.
(Other definitions for aunts that I've seen before include "Sally and others" , "Relatives get bad US tan" , "Relatives get an odd US tan" , "relatively speaking" , "Relatives get a peculiar US tan" .)