One who makes you pay for a horse (7)
I believe the answer is:
charger
'horse' is the definition.
(charger is a type of horse)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for charger that I've seen before include "He doesn't mean it to be a gift" , "could be of use to battery" , "A warhorse; a serving-dish" , "Electrical device - old warhorse" , "needed for battery" .)