Who'll do a lot to deliver domestic energy? (10)
I believe the answer is:
powerhouse
'who'll do' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'a lot to deliver domestic energy?' is the wordplay.
I cannot really see how this works, but
'energy?' could be 'power' ('power' can be a synonym of 'energy') and 'power' is located in the answer.
The remaining letters 'house' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for powerhouse that I've seen before include "Remarkably forceful person" , "Dynamic person" , "Energetic person" , "Dynamo" , "Person with great energy" .)