Canteen stew? (4)
I believe the answer is:
mess
This clue is a double definition.
'canteen' is the first definition.
(I've seen this before)
'stew?' is the second definition.
(I've seen this before)
(Other definitions for mess that I've seen before include "Untidy confusion" , "Confused person" , "Army dining room" , "difficulty" , "State of confusion and disorderliness" .)