Was a bad winner (7)
I believe the answer is:
gloated
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">was a bad 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 gloated that I've seen before include "Crowed" , "Relished maliciously" , "Triumphed" , "Exulted (over)" .)