Luckless one (5)
I believe the answer is:
loser
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">luckless one</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for loser that I've seen before include "lemon" , "one plays without success" , "One failing regularly" , "Unsuccessful contestant" , "A failure, also-ran" .)