Crossword Genius

Black Beauty's unexpected success? (4,5)

Ross

I believe the answer is:

dark horse

I believe this clue is a double definition.

'black beauty's' is the first definition.
(Black Beauty is a fictional black horse)

'unexpected success?' is the second definition.
(term for an unexpectedly successful competitor)

(Other definitions for dark horse that I've seen before include "Competitor whose abilities are unknown" , "Brown heroin" , "Little is known of its properties" , "Competitor about whose abilities little is known" , "Black Beauty, for instance" .)

I've seen this clue in The Times.
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