Stomach for eating rubbish (5)
I believe the answer is:
tripe
I believe this clue is a double definition.
'stomach for eating' is the first definition.
(stomach of an animal eaten as food)
'rubbish' is the second definition.
(both can mean nonsense)
(Other definitions for tripe that I've seen before include "Ruminant's stomach, prepared for cooking" , "Rubbish (colloq.)" , "Ox stomach as food - it's nonsense" , "Edible nonsense?" , "Balderdash" .)