Crossword Genius

Antitoxin (5)

Ross

I believe the answer is:

serum

'antitoxin' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for serum that I've seen before include "Antitoxin derived from blood" , "Blood component containing antibodies, used in immunisation" , "Part of blood; vaccine" , "Watery part of blood" , "Muser in blood" .)

I've seen this clue in The Independent, the Evening Standard and the Penny Press.
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