Youngster cuddling woman’s sweet child (6)
I believe the answer is:
cherub
'sweet child' is the definition.
(I've seen this before)
'youngster cuddling woman's' is the wordplay.
'youngster' becomes 'cub' (I've seen this in other clues).
'cuddling' indicates putting letters inside.
'woman' becomes 'her'.
'cub' placed around 'her' is 'CHERUB'.
(Other definitions for cherub that I've seen before include "Sweet little baby" , "little one with wings" , "Angelic baby" , "Lovely child" , "Sweet innocent baby" .)