Not a winner (5)
I believe the answer is:
loser
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not a winner</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for loser that I've seen before include "One failing regularly" , "A failure, also-ran" , "Defeated person" , "Opposite of winner" , "Flop" .)