Reformed addict possibly damaged neurons (3-4)

I believe the answer is:

non-user

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'reformed addict' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'damaged neurons' is the wordplay.
'damaged' is an anagram indicator.
'neurons' anagrammed gives 'NON-USER'.

'possibly' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.

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