Its rider can hardly dismount! (5)

I believe the answer is:

tiger

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'dismount' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tiger that I've seen before include "Large wild cat" , "he got his stripes" , "Big cat of Asia" , "Large wildcat poetically burning bright" , "Formidable opponent" .)

I've seen this clue in the Evening Standard.

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