Crossword Genius

Mount, possibly on a racehorse (4)

Ross

I believe the answer is:

pony

I'm a little stuck... Click here to teach me more about this clue!

'racehorse' is the definition.
(pony is a kind of racehorse)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for pony that I've seen before include "Small horse - GBP25" , "(girl's pet, perhaps)" , "Horse (worth PS25?)" , "Small horse - PS25" , "Horse (worth GBP25?)" .)

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