Conundrums (7)
I believe the answer is:
riddles
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">conundrums</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know this)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for riddles that I've seen before include "Tricky questions" , "Conundrums" , "Brain-teasers and coarse sieves" , "problems" , "Funny little teasers" .)