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Unlikely victor: Black Beauty? (4,5)

Ross

I believe the answer is:

dark horse

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

This could be a double definition.

'unlikely victor' is the first definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'black beauty?' is the second definition.
(Black Beauty is a fictional black horse)

Can you help me to learn more?

(Other definitions for dark horse that I've seen before include "Little is known of its properties" , "Brown heroin" , "Unexpected (possible) winner" , "Successful competitor of whom little was known, like colourless equine" , "it may be foolish to discount" .)

I've seen this clue in The Sun.
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