Aesthetically offensive (4)
I believe the answer is:
ugly
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">aesthetically offensive</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 ugly that I've seen before include "Deficient in beauty" , "Offensive to one's sight or other senses" , "Like an eyesore" , "Of unpleasant appearance" , "Extremely unattractive" .)