An article of faith, one way or another (5)
I believe the answer is:
tenet
I believe this clue is a double definition.
'an article of faith' is the first definition.
(I've seen this in another clue)
'one way or another' is the second definition.
(Other definitions for tenet that I've seen before include "A religious doctrine proclaimed as true without proof" , "Doctrine; principle held" , "A palindromic doctrine or belief" , "Adiaphoron" , "Fundamental belief" .)