gallbladder contents (4)
I believe the answer is:
bile
'gallbladder contents' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bile that I've seen before include "Irritability, bad temper" , "Fluid secreted by the liver" , "Spleen" , "Ill-temper" , "Anger, bitterness" .)