Tough question (5)
I believe the answer is:
poser
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tough question</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for poser that I've seen before include "Toughie" , "Hard problem" , "Pseud" , "Maybe model" , "difficult puzzle" .)