Regulates (8)
I believe the answer is:
controls
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">regulates</span>' is the definition.<br/ ><span class="explanation-format__explanation">(controlling is a kind of regulating)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for controls that I've seen before include "Exercises power over" , "Directs, governs" , "Directs or operates" , "Regulates" , "Manages the regulatory mechanisms" .)