Mess food? (4)
I believe the answer is:
hash
I believe this is a double definition.
'mess' is the first definition.
(thesaurus)
'food?' is the second definition.
(hash is a kind of food)
(Other definitions for hash that I've seen before include "Minced meat and vegetables - a mess!" , "Recycled food" , "Meat dish or hallucinogen" , "Drug" , "number provided by American" .)