Name given to grasshopper or cicada during the swarming phase (6)

I believe the answer is:

locust

(Other definitions for locust that I've seen before include "Destructive creature" , "Destructive winged insect" , "Voracious insect, travels in swarms" , "Voracious grasshopper that travels in swarms" , "plaguey type" .)

I've seen this clue in The Guardian.

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