Crossword Genius

Unexpected winner, on the farm? (4,5)

Ross

I believe the answer is:

dark horse

(Other definitions for dark horse that I've seen before include "Unknown quantity" , "Competitor about whose abilities little is known" , "Little-known competitor like shadowy equine" , "Competitor whose abilities are unknown" , "it may be foolish to discount" .)

I've seen this clue in The Wall Street Journal.
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