Antivenin, for instance (5)

I believe the answer is:

serum

(Other definitions for serum that I've seen before include "Watery fluid from animal tissue" , "Part of blood; vaccine" , "Antitoxin derived from blood" , "Watery liquid as from blister, or fluid in blood" , "Constituent of blood" .)

I've seen this clue in the Newsday.

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