Not a pretty sight in the Dining Room (4)
I believe the answer is:
mess
This clue is a double definition.
'not a pretty sight' is the first definition.
(I've seen this in another clue)
'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 "Jumble" , "Where those who serve eat" , "4 [DISORDER]" , "Disarray" , "Place to eat" .)