Cook clouts insect (6)
I believe the answer is:
locust
'insect' is the definition.
(locust is a kind of insect)
'cook clouts' is the wordplay.
'cook' is an anagram indicator.
'clouts' with letters rearranged gives 'LOCUST'.
(Other definitions for locust that I've seen before include "Destructive insect; tree" , "Destructive creature" , "Voracious grasshopper that travels in swarms" , "It strips plants" , "Swarming, devouring, insect" .)