One who fixes the price for a horse (7)

I believe the answer is:

charger

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'horse' is the definition.
(charger is a kind of horse)

I don't understand the remainder of the clue.

(Other definitions for charger that I've seen before include "One may provide juice" , "old dish" , "I expect payment" , "Type of platter" , "Battle horse" .)

I've seen this clue in The Globe and Mail.

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