You'd better believe it! (5)

I think it could be either:

Which length description are you looking for?:

dogma

'you'd better believe it' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for dogma that I've seen before include "Code of beliefs accepted as authoritative" , "Religious doctrine proclaimed as true without proof" , "Article of faith" , "Code of belief" , "church teaching" .)

I've seen this clue in The New York Times and the Universal.

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