Divine being cuddled by nymph, before mum who steps in unexpectedly (5,9)
I believe the answer is:
fairy godmother
'divine being cuddled by nymph before mum who steps in unexpectedly' is the definition.
The definition suggests a singular noun which matches the answer.
'divine being cuddled by nymph before mum' is the wordplay.
'divine being' becomes 'god' (I've seen this in another clue).
'cuddled by' means one lot of letters goes inside another (I've seen this in other clues).
'nymph before' becomes 'fairy' (I can't justify this - if you can you should give a lot more credence to this answer).
'mum' becomes 'mother' (I've seen this before).
'fairy'+'mother'='fairymother'
'god' going into 'fairymother' is 'FAIRY GODMOTHER'.
Can you help me to learn more?
(Other definitions for fairy godmother that I've seen before include "panto character" , "lucky lady" , "Sweet lady" , "Benefactor" , "Cinderella's benefactress" .)