Principle of having it both ways? (5)
I believe the answer is:
tenet
I believe this is a double definition.
'principle' is the first definition.
(a tenet is a principle or value)
'having it both ways?' is the second definition.
'of' is the link.
(Other definitions for tenet that I've seen before include "It's believed" , "Teaching" , "Palindromic principle or belief" , "Belief held as true" , "Doctrine, dogma, belief" .)