Deploy (3)
I believe the answer is:
use
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">deploy</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for use that I've seen before include "Employ; consume" , "Employment; utilise" , "Manipulate" , "Employ - advantage" , "Practise" .)