Keep under control (8)
I believe the answer is:
restrain
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">keep under control</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 restrain that I've seen before include "Hold back, tether" , "Stop" , "use handcuffs?" , "Control - check" , "bar" .)