Panacea provided by a twister touring part of Ealing (7)

I believe the answer is:

cureall

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'twister touring part of ealing' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'panacea provided by a' is the wordplay.
'panacea' becomes 'cure' (I've seen this in another clue).
'provided' becomes 'll' (I can't explain this - if you can you should give a lot more credence to this answer).
'by' says to put letters next to each other.
'll' after 'a' is 'all'.
'cure'+'all'='CUREALL'

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I've seen this clue in the Evening Standard.

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