Not written (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not written</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for oral that I've seen before include "Concerning the mouth" , "Relating to speech" , "Kind of exam" , "Viva voce" , "Exam using speech" .)