Debate (with "out") (4)
I believe the answer is:
hash
'debate with out' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hash that I've seen before include "Reheated dish" , "that's smoked a lot" , "Dish of diced meat etc - cannabis (slang)" , "Stew - key" , "Meat dish or hallucinogen" .)