How to be green on bike (7)

I believe the answer is:

recycle

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'how to be green' is the definition.
I can't judge whether this definition defines the answer.

'on bike' is the wordplay.
'on' becomes 're' ('on' can be mean 'with reference to').
'bike' becomes 'cycle' (synonyms).
're'+'cycle'='RECYCLE'

Can you help me to learn more?

(Other definitions for recycle that I've seen before include "save resources" , "Convert waste to new usage" , "Use (rubbish) again" , "be green" , "Process for re-use" .)

I've seen this clue in The Guardian.

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