Superficial appearance (6)
I believe the answer is:
veneer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">superficial appearance</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 veneer that I've seen before include "Thin layer glued to a surface" , "Thin layer of fine wood covering surface of cheaper wood" , "Thin coating on the outside" , "Thin wooden facing" , "Thin wooden surface" .)