Possibly a green method of recycling maps (10)

I believe the answer is:

chartreuse

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

'green method of recycling maps' is the definition.
'chartreuse' can be an answer for 'green' (I've seen this before). I'm unsure of the 'method of recycling maps' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for chartreuse that I've seen before include "Pale green-yellow colour" , "Green or yellow liqueur made by monks" , "Green-yellow liqueur" , "The spirit" , "Carthusian liqueur" .)

I've seen this clue in The Times.

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