Conspire, plot (6)
I believe the answer is:
scheme
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">conspire</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">plot</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(scheming is a kind of plotting)</span><br/ ><br/ ></span>
(Other definitions for scheme that I've seen before include "Systematic plan, plot" , "Secret plan, plot" , "Project or strategy" , "Plot, plan secretly" , "Wheel and deal" .)