Crossword Genius

Horse that's ridden at the peak (5)

Ross

I believe the answer is:

mount

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

'the peak' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for mount that I've seen before include "Climb - eg Everest" , "Climb, stairs say" , "seat" , "Increase" , "Fix onto a backing" .)

I've seen this clue in the Sydney Morning Herald.
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