Boundless energy from a cat with one special ability - absorbing carbon! (6,5)
I believe the answer is:
atomic power
'absorbing carbon' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'boundless energy from a cat with one special ability' is the wordplay.
I cannot really understand how this works, but
'energy' could be 'atomic' (atomic energy is a kind of energy) and 'atomic' is present in the answer.
'from' could be 'o' (I've seen this in other clues) and 'o' is present in the answer.
'with' could be 'w' (abbreviation) and 'w' is present in the answer.
'a' could be 'per' (eg 'one a day' means 'one per day') and 'per' is located in the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for atomic power that I've seen is " reactionary aftermath?".)