Nonsense food (5)
I believe the answer is:
tripe
I believe this clue is a double definition.
'nonsense' is the first definition.
(informal term for nonsense or false information)
'food' is the second definition.
(tripe is a kind of food)
(Other definitions for tripe that I've seen before include "Edible nonsense?" , "Junk; food" , "Garbage" , "Rubbish, nonsense" , "which a freegan might eat?" .)