Stupidly I led a riot as an expression of feeling (9)
I believe the answer is:
editorial
'an expression of feeling' is the definition.
I can't tell whether this definition defines the answer.
'stupidly i led a riot' is the wordplay.
'stupidly' indicates an anagram (a stupid ordering of the letters).
'i'+'led'+'a'+'riot'='iledariot'
'iledariot' with letters rearranged gives 'EDITORIAL'.
'as' acts as a link.
Can you help me to learn more?
(Other definitions for editorial that I've seen before include "Newspaper article giving the editor's opinions" , "Article written" , "Newspaper item" , "Statement of a newspaper's opinion" , "Article expressing the views of the publication" .)