Watery liquid (4)
'watery liquid' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for whey that I've seen before include "Milk component" , "Water separated from milk" , "Product of clotting milk" , "Watery remains after the curds are separated in milk" , "Watery constituent of milk" .)
'watery liquid' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for serum that I've seen before include "Muser in blood" , "Inoculation liquid" , "Watery fluid from animal tissue" , "Constituent of blood" , "Watery liquid as from blister, or fluid in blood" .)