Disorder in the dining room (4)
I believe the answer is:
mess
This clue is a double definition.
'disorder' is the first definition.
(I know that mess is a type of disorder)
'the dining room' is the second definition.
(mess is a kind of dining room)
'in' acts as a link.
(Other definitions for mess that I've seen before include "Military dining area" , "Dirty or untidy state" , "Forces' dining room" , "terrible state" , "Army canteen - shambles" .)