Adapting ironclad tenet primarily! (9)

I believe the answer is:

doctrinal

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'adapting ironclad tenet primarily' is the definition.
I can't judge whether this defines the answer.

'adapting ironclad tenet primarily' is the wordplay.
'adapting' is an anagram indicator.
'primarily' indicates taking the first letters.
The first letter of 'tenet' is 't'.
'ironclad'+'t'='ironcladt'
'ironcladt' with letters rearranged gives 'DOCTRINAL'.

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(Another definition for doctrinal that I've seen is " Relating to beliefs".)

I've seen this clue in the Sydney Morning Herald.

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