Patronising — impish (4)
I believe the answer is:
arch
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">patronising</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that patronising can be written as arch)</span><br/ ><br/ >'<span class="explanation-format__original">impish</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for arch that I've seen before include "in short, is out of date" , "Leading figures" , "Chief - part of foot" , "Knowing, sly" , "Curved masonry construction" .)