I don't know the answer! (4)
I believe the answer is:
pass
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">i don't know the answer</span>' is the definition.<br/ ><span class="explanation-format__explanation">(you might say 'pass' to skip a question)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for pass that I've seen before include "Transfer" , "complimentary ticket" , "Get through exam" , "approved" , "Amatory advance" .)