Eco-friendly energy for every plant (5,6)

I believe the answer is:

green pepper

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'plant' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'eco-friendly energy for every' is the wordplay.
'eco-friendly' becomes 'green' (green can mean good for the environment).
'energy' becomes 'pep' (personal energy, vim).
'for every' becomes 'per' ('per' means 'for each' or 'for every').
'green'+'pep'+'per'='GREEN PEPPER'

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I've seen this clue in The Mirror.

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