A sweet child angel? (6)
I believe the answer is:
cherub
I believe this clue is a double definition.
'a sweet child' is the first definition.
(I've seen this before)
'angel?' is the second definition.
(I know that cherub is a type of angel)
(Other definitions for cherub that I've seen before include "Lovely child" , "goody-goody?" , "Angelic child" , "Sweet, innocent child" , "A heavenly baby" .)