Relative wearing adult hot pants (8-2-3)
I believe the answer is:
daughter-in-law
'relative' is the definition.
(daughter-in-law is a kind of relative)
'wearing adult hot pants' is the subsidiary indication.
'hot' becomes 'h'.
'pants' is an anagram indicator (UK informal term for \'nonsense\' or \'rubbish\').
'wearing'+'adult'+'h'='wearingadulth'
'wearingadulth' with letters rearranged gives 'daughterinlaw'.
(Other definitions for daughter-in-law that I've seen before include "Woman married to one's child" , "One's son's wife" , "Female relative by marriage" .)