Wash — food for pigs (5)
I believe the answer is:
swill
I believe this clue is a double definition.
'wash' is the first definition.
(I've seen this before)
'food for pigs' is the second definition.
(I've seen this before)
(Other definitions for swill that I've seen before include "Pig-food; rinse" , "drink heavily" , "Pigfeed" , "Refuse" , "Wet pig feed" .)