Uncouth, upsetting me all dinner (3-8)
I believe the answer is:
ill-mannered
'uncouth' is the definition.
(thesaurus)
'upsetting me all dinner' is the subsidiary indication.
'upsetting' indicates an anagram.
'me'+'all'+'dinner'='mealldinner'
'mealldinner' anagrammed gives 'illmannered'.
(Other definitions for ill-mannered that I've seen before include "Rude, discourteous" , "Boorish - uncivil" , "Rude - uncouth" .)