Plan; arrangement (6)
I believe the answer is:
scheme
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">plan</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that scheme is a type of plan)</span><br/ ><br/ >'<span class="explanation-format__original">arrangement</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for scheme that I've seen before include "Connive, intrigue" , "Plan; system" , "Elaborate and systematic plan of action" , "Design" , "Lay plans" .)