Component of blood (6)
'component of blood' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for plasma that I've seen before include "TV screen type" , "Hot ionised gas" , "The watery part of the blood" , "part of donor's contribution?" , "Blood component and type of television" .)
'component of blood' 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 "Liquid separating from coagulating blood" , "Antitoxin derived from blood" , "Watery liquid as from blister, or fluid in blood" , "Constituent of blood" , "Part of blood; vaccine" .)