Metal containing iron is green, perhaps (6)

I believe the answer is:

leafed

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'green perhaps' is the definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I can't see?

'metal containing iron' is the wordplay.
'metal' becomes 'lead' (lead is a kind of metal).
'containing' means one lot of letters goes inside another.
'iron' becomes 'Fe' (Fe is the chemical symbol for iron).
'lead' enclosing 'fe' is 'LEAFED'.

'is' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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