Look bad together (5)
I believe the answer is:
clash
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">look bad together</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 clash that I've seen before include "Forceful disagreement" , "Fail to fit" , "Disagree violently" , "Mismatch" , "Conflict; be incompatible" .)