Destructive grasshopper (6)
I believe the answer is:
locust
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">destructive grasshopper</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for locust that I've seen before include "plaguey type" , "Swarming grasshopper" , "Grasshopper of warm regions" , "Ravenous insect" , "Sturdy, resilient" .)