Irate idol conditioned to be a leader (9)

I believe the answer is:

editorial

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'leader' is the definition.
(type of newspaper article)

'irate idol conditioned to be a' is the wordplay.
'irate idol' anagrams to 'EDITORIAL'.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for editorial that I've seen before include "bit of paper" , "Leading article" , "Newspaper article giving the editor's opinions" , "(Paper's) leader" , "matter of opinion" .)

I've seen this clue in the Sydney Morning Herald.

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