Stratagem, manoeuvre (6)
I believe the answer is:
gambit
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">stratagem</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that stratagem can be written as gambit)</span><br/ ><br/ >'<span class="explanation-format__original">manoeuvre</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that gambit is a type of manoeuvre)</span><br/ ><br/ ></span>
(Other definitions for gambit that I've seen before include "Opening chess move" , "Sacrificial strategy in chess" , "Initial move found in bag, Tim" , "opening on board" , "An opening sacrifice in chess for positional advantage" .)