Watery component of blood (5)

I believe the answer is:

serum

(Other definitions for serum that I've seen before include "Amber-coloured fluid in the blood" , "Antitoxin derived from blood" , "Liquid separating from coagulating blood" , "Watery fluid from animal tissue" , "Part of blood; vaccine" .)

I've seen this clue in The Guardian.

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