Treat with powerful agent organised in European zoos (7)

I believe the answer is:

ozonise

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'treat with powerful agent' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'organised in european zoos' is the wordplay.
'organised' is an anagram indicator.
'european' becomes 'E' (abbreviation e.g. EU).
'in'+'e'+'zoos'='inezoos'
'inezoos' is an anagram of 'OZONISE'.

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I've seen this clue in The Times.

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