Less attractive (6)
I believe the answer is:
uglier
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">less attractive</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 uglier that I've seen before include "with worse features" , "More frightful" , "More offensive to look at" , "More unattractive or repellent to the eye" , "More displeasing to the sight" .)