Aesthetic quality (6)
I believe the answer is:
beauty
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">aesthetic quality</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 beauty that I've seen before include "Eye-pleasing quality" , "Aesthetic quality" , "A quality pleasing to the senses" , "` `. . . . . . is only skin-deep' '" , "See 40" .)