Unlikely winner (8)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unlikely winner</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)