Destructive grasshopper (6)
I believe the answer is:
locust
'destructive grasshopper' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for locust that I've seen before include "plaguey type" , "Swarming grasshopper" , "Grasshopper of warm regions" , "Ravenous insect" , "Sturdy, resilient" .)