Crossword Genius

Antibiotic (10)

Ross

I believe the answer is:

penicillin

'antibiotic' is the definition.
(penicillin is a kind of antibiotic)

This is all the clue.

(Other definitions for penicillin that I've seen before include "17" , "Common antibiotic" .)

I've seen this clue in The Mirror.
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