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One of two footholds on the mount (7)

Ross

I believe the answer is:

stirrup

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This could be a double definition.

'one of two footholds' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'the mount' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'on' is the link.

Can you help me to learn more?

(Other definitions for stirrup that I've seen before include "Rider's foot rest" , "Horse rider's footrest" , "Foot support in riding" , "Foot rest for a rider" , "Rider's foot loop" .)

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