Belief either way (5)

I believe the answer is:

tenet

I believe this clue is a double definition.

'belief' is the first definition.
(synonyms)

'either way' is the second definition.

(Other definitions for tenet that I've seen before include "A palindromic doctrine or creed" , "Belief - maxim" , "Item of belief" , "Matter of belief" , "Doctrine; principle held" .)

I've seen this clue in The Irish Independent and the Universal.

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