Doctrine accepted without question (5)
I believe the answer is:
dogma
'doctrine accepted without question' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for dogma that I've seen before include "A religious belief" , "Inflexible principle" , "church teaching" , "Beliefs laid down as incontrovertibly true" , "Body of religious doctrine" .)