Superior, knowing (4)
I believe the answer is:
arch
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">superior</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">knowing</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for arch that I've seen before include "Masonry structure for spanning an opening" , "Coyly playful" , "Knowing, sly" , "Curved form" , "Curve of a bridge" .)