Destructive person (6)
I believe the answer is:
vandal
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">destructive person</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 vandal that I've seen before include "Person who maliciously damages things" , "Person causing wanton damage" , "One who causes wilful damage to property" , "Old German" , "Destructive type" .)