Moral he created in cardigan opening (7)

I believe the answer is:

armhole

I'm a little stuck... Click here to teach me more about this clue!

'cardigan opening' is the definition.
'armhole' can be an answer for 'opening' (armhole is a kind of opening). I'm not certain of the 'cardigan' bit.

'moral he created' is the wordplay.
'created' is an anagram indicator (I've seen 'create' mean this).
'moral'+'he'='moralhe'
'moralhe' with letters rearranged gives 'ARMHOLE'.

'in' is the link.

Can you help me to learn more?

(Other definitions for armhole that I've seen before include "Feature of coat" , "Space" , "Jacket opening" , "Garment opening" , "Garment aperture" .)

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

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