Crossword Genius

Competitor with hidden talent (4,5)

Ross

I believe the answer is:

dark horse

(Other definitions for dark horse that I've seen before include "Black Beauty, for instance" , "Unknown quantity" , "Little-known competitor like shadowy equine" , "Competitor about whose abilities little is known" , "Little is known of its properties" .)

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