Ugly sight (7)
I believe the answer is:
eyesore
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ugly sight</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for eyesore that I've seen before include "Something exceedingly ugly" , "Blight" , "Unpleasant sight" , "Ugly building" , "Something ugly and offensive" .)