Like proverbial milk (5)
I believe the answer is:
spilt
'like proverbial milk' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for spilt that I've seen before include "(Liquid) slopped" , "(Of liquid) dropped" , "Poured forth" , "Overflowed" , "Slopped over the edge" .)