Crossword Genius

Once in my treatment, an antibiotic (8)

Ross

I believe the answer is:

neomycin

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

'once in my treatment' is the wordplay.
'treatment' is an anagram indicator (letters treated or processed differently).
'once'+'in'+'my'='onceinmy'
'onceinmy' is an anagram of 'NEOMYCIN'.

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