Unlikely winner (8)

I think it could be either:

underdog

longshot

'unlikely winner' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for underdog that I've seen before include "One at a disadvantage" , "unlikely winner" , "Lower-rated competitor" , "Unlikely Victor could be" , "Likely loser" .)

I've seen this clue in the USA Today and The Sun.

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