Something very ugly (7)
I believe the answer is:
eyesore
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">something very ugly</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 eyesore that I've seen before include "Horrible sight" , "Blemish" , "terrible prospect" , "Ugly item" , "Hideous sight" .)