Cycling picture screened by commercial channel is authorised (9)

I believe the answer is:

canonical

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'authorised' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs sometimes define each other.

I don't understand the remainder of the clue.

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(Other definitions for canonical that I've seen before include "Standard" , "Accepted as being authoritative" .)

I've seen this clue in The Telegraph.

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