Sty chow (4)
I believe the answer is:
slop
'sty chow' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for slop that I've seen before include "(Of liquid) spill over" , "Liquid refuse, swill" , "Cause to spill over" , "overflow" , "Spilled liquid" .)