Fly of ponds and streams (6)

I believe the answer is:

caddis

(Other definitions for caddis that I've seen before include "Mothlike insect's larva" , "Immature swimmer" , "Aquatic larva of fly" , "worm" , "Fly of ponds and streams that camouflages itself" .)

I've seen this clue in The Irish Times.

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