I led a riot: damaged column (9)
I believe the answer is:
editorial
'column' is the definition.
(I know that column can be written as editorial)
'i led a riot damaged' is the wordplay.
'damaged' indicates anagramming the letters.
'i'+'led'+'a'+'riot'='iledariot'
'iledariot' with letters rearranged gives 'EDITORIAL'.
(Other definitions for editorial that I've seen before include "Article giving a newspaper's opinion" , "Statement of a newspaper's opinion" , "matter of opinion" , "leader, perhaps" , "Paper's opinion piece" .)