Antibiotic came in your treatment (10)

I believe the answer is:

aureomycin

'antibiotic' is the definition.
(I know that Aureomycin is a type of antibiotic)

'came in your treatment' is the wordplay.
'treatment' is an anagram indicator (letters treated or processed differently).
'came'+'in'+'your'='cameinyour'
'cameinyour' is an anagram of 'AUREOMYCIN'.

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

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