Duplicity, dishonesty (6)
I believe the answer is:
deceit
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">duplicity</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">dishonesty</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(deceit is a kind of dishonesty)</span><br/ ><br/ ></span>
(Other definitions for deceit that I've seen before include "Dishonest trick" , "Chicanery" , "Hypocrisy" , "Dishonesty, misrepresentation" , "Hoodwinking" .)