Divine offspring — one sponsored at a baptism (8)
I believe the answer is:
godchild
'one sponsored at a baptism' is the definition.
I can't judge whether this definition defines the answer.
'divine offspring' is the wordplay.
'divine' becomes 'god' (I can't explain this - if you can you should believe this answer much more).
'offspring' becomes 'child' (child is a kind of offspring).
'god'+'child'='GODCHILD'
Can you help me to learn more?
(Other definitions for godchild that I've seen before include "Sponsored infant" , "Sponsored baptised baby" , "One sponsored at christening" , "Sponsored individual" , "Religious protege" .)