Punish severely (7)
I believe the answer is:
scourge
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">punish severely</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for scourge that I've seen before include "Affliction - whip" , "Whip; source of suffering" , "Punish severely" , "Whip; agent of suffering" , "Whip, flog" .)