Crossword Genius

Insect with a lot to learn? (8)

Ross

I believe the answer is:

greenfly

I'm a little stuck... Click here to teach me more about this clue!

'insect' is the definition.
(greenfly is a kind of insect)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for greenfly that I've seen before include "Garden pest" , "Common aphid" , "Pests" , "Common aphids" .)

I've seen this clue in The Globe and Mail.
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