It may be held either way (5)
I believe the answer is:
tenet
This clue is a double definition.
'it may be held' is the first definition.
(idea or belief someone might hold)
'either way' is the second definition.
(Other definitions for tenet that I've seen before include "Matter of belief" , "A palindromic doctrine or creed" , "Article of belief" , "A religious doctrine proclaimed as true without proof" , "Doctrine, dogma, belief" .)