Crossword Genius

Blood fluid (5)


I believe the answer is:


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

This is all the clue.

(Other definitions for serum that I've seen before include "Watery part of blood" , "Blood component containing antibodies, used in immunisation" , "Antitoxin derived from blood" , "Liquid separating from coagulating blood" , "Watery liquid as from blister, or fluid in blood" .)

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