Grips (6)
I believe the answer is:
grasps
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">grips</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know this)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for grasps that I've seen before include "Understands" , "holds" , "Gets hold of" , "Takes hold of firmly" , "Grips" .)