Of the mouth (4)
I believe the answer is:
oral
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">of the mouth</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for oral that I've seen before include "Spoken, of the mouth" , "Ant; tourist (dial.)" , "'Spoken, not written (4)'" , "Spoken - examination" , "language exam" .)