It's accepted by the authorities there is no threat in article of faith (8)

I believe the answer is:

official

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'it's accepted' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for official that I've seen before include "Bureaucrat" , "It's no rumour - he's in charge" , "agent" , "Authorised representative" , "Public employee" .)

I've seen this clue in The Irish Times.

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