Lacking experience with cunning garden pests (8)

I believe the answer is:

greenfly

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

'garden pests' is the definition.
'greenfly' can be an answer for 'pests' (I've seen this before). I am not certain of the 'garden' bit.

'lacking experience with cunning' is the wordplay.
'lacking experience with' becomes 'green' (I am not sure about this - if you are sure you should believe this answer much more).
'cunning' becomes 'fly' (fly can mean skilful or sharp).
'green'+'fly'='GREENFLY'

Can you help me to learn more?

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

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