Plotter, intriguer (11)
I believe the answer is:
conspirator
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">plotter</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">intriguer</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for conspirator that I've seen before include "Secret plotter" , "Planner in secret" , "Person who secretly plots with others" .)