Starters of marinated eel sushi served in dining room (4)
I believe the answer is:
mess
'dining room' is the definition.
(thesaurus)
'starters of marinated eel sushi served' is the wordplay.
'starters of' suggests taking the first letters.
The first letters of 'marinated eel sushi served' is 'MESS'.
'in' acts as a link.
(Other definitions for mess that I've seen before include "Mix-up" , "Confused situation" , "difficulty" , "Communal dining room" , "Forces' dining room" .)