Take control of (7)
I believe the answer is:
harness
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">take control of</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for harness that I've seen before include "Control - some tack" , "Hitch up" , "Exploit, utilise" , "Straps and fittings for horse control" , "Control; trappings" .)