Hit violently (3,4)
I believe the answer is:
lay into
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hit violently</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for lay into that I've seen before include "Hit violently" , "Set about" , "beat" , "Informally thrash, or reprimand harshly" , "giving abuse" .)