Crossword Genius

Little known competitor like 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 clue might be a double definition.

'little known competitor' is the first definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see a link between them that I can't see?

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

'like' is the link.

Can you help me to learn more?

(Other definitions for dark horse that I've seen before include "One about whom little is known" , "Successful competitor of whom little was known, like colourless equine" , "it may be foolish to discount" , "Competitor whose abilities are unknown" , "Unexpected (possible) winner" .)

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