Sudden movement (5)
I believe the answer is:
lunge
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sudden movement</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for lunge that I've seen before include "Thrust, sudden pass" , "Make a thrusting forward movement" , "Sudden thrust forward" , "(Make a) forward thrust" , "Trust forward as with sword" .)