Unothodox doctrine, with payment deferred (2,6)

I believe the answer is:

on credit

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'payment deferred' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'unothodox doctrine' is the wordplay.
'doctrine' can be anagrammed to 'ON CREDIT'.
But, I'm not sure how the anagram is indicated.

'with' acts as a link.

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