Stratagem or trick (4)
I believe the answer is:
ruse
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">stratagem</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(a ruse is a stratagem or ploy)</span><br/ ><br/ >'<span class="explanation-format__original">trick</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in other clues)</span><br/ ><br/ ></span>
(Other definitions for ruse that I've seen before include "Cunning scheme" , "Deceptive device" , "Ploy, artifice" , "Trick, stratagem" , "Sure to be a trick" .)