How Meg and Ron changed when produced in local area (9)

I believe the answer is:

homegrown

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'produced in local area' is the definition.
The answer and definition are not the same part of speech. However, past participle verbs and adjectives sometimes mean the same thing.

'how meg and ron changed' is the wordplay.
'and' says to put letters next to each other.
'changed' is an anagram indicator.
'how'+'meg'+'ron'='howmegron'
'howmegron' anagrammed gives 'HOMEGROWN'.

'when' is the link.

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I've seen this clue in the Sydney Morning Herald.

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