Blood component (5)
'blood component' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for plasma that I've seen before include "A psalm (anag.)" , "The watery part of the blood" , "Ionised gas; fluid in blood" , "Component of TV screen" , "Star material" .)
'blood component' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for serum that I've seen before include "Blood component containing antibodies, used in immunisation" , "Constituent of blood" , "Amber-coloured fluid in the blood" , "Liquid separating from coagulating blood" , "Watery part of blood" .)