Crossword Genius

One expecting payment for horse (7)

Ross

I believe the answer is:

charger

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This clue could be a double definition.

'one expecting payment' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'for horse' is the second definition.
(charger is a type of horse)

Can you help me to learn more?

(Other definitions for charger that I've seen before include "One loading" , "One asking money for" , "I expect payment" , "that would prevent loss of power?" , "Cavalry horse - used on battery" .)

I've seen this clue in The Sun.
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