Feigning; performing (6)
I believe the answer is:
acting
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">feigning</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">performing</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(acting is a kind of performing)</span><br/ ><br/ ></span>
(Other definitions for acting that I've seen before include "Feigning" , "Temporary - work in the theatre" , "Performing on stage" , "Playing a part" , "Filling a role on a temporary basis" .)