Crossword Genius

Blood fluid (5)

Ross

I believe the answer is:

serum

'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 Sydney Morning Herald, the King Feature Syndicate and the Penny Press.
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