Note extracted from hidden bug (6)

I believe the answer is:

insect

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'bug' is the definition.
(bug can mean an insect)

I cannot understand how the remainder of the clue works.

(Other definitions for insect that I've seen before include "Possibly fly" , "Eg, ant" , "Six-legged animal" , "Small creature with six legs and no backbone" , "E.g. cricket" .)

I've seen this clue in The Independent.

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