One defeated (5)
I believe the answer is:
loser
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">one defeated</span>' is the definition.<br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for loser that I've seen before include "One who is (always) unsuccessful" , "Defeated person" , "Person who's a failure" , "Failed competitor" , "one plays without success" .)