Crossword Genius

Maybe litter producer's unchallengeable conviction (5)

Ross

I believe the answer is:

dogma

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'conviction' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

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(Other definitions for dogma that I've seen before include "Doctrine laid down with authority" , "Item of belief" , "Doctrine put forward as true, not to be questioned" , "Belief, precept" , "Non-evidence based opinion" .)

I've seen this clue in The Telegraph.
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