Sudden impact (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sudden impact</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for jolt that I've seen before include "A sudden jar" , "Sudden jerk" , "Jostle; shock" , "elbow" , "bump" .)