Exclusive control (8)
I believe the answer is:
monopoly
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">exclusive control</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for monopoly that I've seen before include "Situation of one company's dominance in a particular market" , "Domination" , "No competition" , "Board game with property dealing" , "Market in which there are many buyers but only one seller" .)