Little boy cuddles that woman’s sweet child (6)
I believe the answer is:
cherub
'sweet child' is the definition.
(I've seen this before)
'little boy cuddles that woman's' is the wordplay.
'little boy' becomes 'cub' (cub is a kind of boy. I am not sure about the 'little' bit.).
'cuddles' is an insertion indicator.
'that woman' becomes 'her' ('her' refers to a woman).
'cub' placed around 'her' is 'CHERUB'.
Can you help me to learn more?
(Other definitions for cherub that I've seen before include "innocent young thing" , "Angel portrayed as a winged child" , "goody-goody?" , "Angelic baby" , "Member of heavenly group" .)