Joke, jape (4)
I believe the answer is:
jest
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">joke</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that joke can be written as jest)</span><br/ ><br/ >'<span class="explanation-format__original">jape</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that jape can be written as jest)</span><br/ ><br/ ></span>
(Other definitions for jest that I've seen before include "Jape, witticism" , "Witty remark" , "it's not serious, so to speak" , "Act in a joking manner" , "attempt at humour" .)