Break violently (5)
I believe the answer is:
smash
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">break violently</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 smash that I've seen before include "Violently break into pieces" , "Ruin; big (success)" , "tremendous success!" , "Break suddenly into little pieces" , "very successful hit" .)