Little beauty that woman found in beastly baby (6)
I believe the answer is:
cherub
'beastly baby' is the definition.
'cherub' can be an answer for 'baby' (I have seen 'Innocent baby ' mean 'cherub' so perhaps 'baby' could also mean 'cherub'). I am not sure about the 'beastly' bit.
'little beauty that woman found in' is the wordplay.
'little beauty' becomes 'cub' (I can't explain this - if you can you should believe this answer much more).
'that woman' becomes 'her' (her refers to a woman).
'found in' indicates putting letters inside.
'cub' placed around 'her' is 'CHERUB'.
Can you help me to learn more?
(Other definitions for cherub that I've seen before include "sweet infant" , "Angelic child" , "innocent-looking child" , "Little angel" , "A heavenly winged babe" .)