Winner in an upset (8)

I believe the answer is:

underdog

(Other definitions for underdog that I've seen before include "Someone at a disadvantage and likely to lose" , "Contestant who's not expected to win" , "One at a disadvantage" , "Grounded by subordinate person" , "Unlikely Victor could be" .)

I've seen this clue in the King Feature Syndicate.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.