Daughter used suet in pairs (5)
I believe the answer is:
duets
'pairs' is the definition.
(I know this)
'daughter used suet in' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'used' indicates an anagram.
'in' is an insertion indicator.
'suet' with letters rearranged gives 'uets'.
'd' put inside 'uets' is 'DUETS'.
(Other definitions for duets that I've seen before include "Works for two" , "Songs sung by two" .)