Daily feature, upsetting real idiot (9)
I believe the answer is:
editorial
'daily feature' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'upsetting real idiot' is the wordplay.
'upsetting' indicates anagramming the letters.
'real'+'idiot'='realidiot'
'realidiot' with letters rearranged gives 'EDITORIAL'.
Can you help me to learn more?
(Other definitions for editorial that I've seen before include "Newspaper opinion piece" , "Article written" , "Leading article" , "Newspaper item" , "Newspaper article giving the editor's opinions" .)