Leftovers dish
I believe the answer is:
hash
'leftovers dish' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hash that I've seen before include "dish of meat and potatoes" , "Recooked dish for shah" , "reheated meat and vegetables" , "preparation that's nothing new" , "Reheated dish" .)