Electric vehicle behind a 50% reduction in carbon (6,3)
I believe the answer is:
bumper car
'electric' is the definition.
(bumper car is a kind of electric)
'vehicle behind a 50% reduction in carbon' is the wordplay.
I cannot quite understand how this works, but
'vehicle' could be 'car' (car is a kind of vehicle) and 'car' is present in the answer.
'behind' could be 'bum' (synonyms) and 'bum' is found within the answer.
'a' could be 'per' (eg 'one a day' means 'one per day') and 'per' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for bumper car that I've seen is " one's driven to a series of bashes".)