Never ate it turning obstinate (10)

I believe the answer is:

inveterate

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

'obstinate' is the definition.
Both the definition and answer are adjectives. Perhaps there's an association between them I don't understand?

'never ate it turning' is the wordplay.
'turning' is an anagram indicator.
'never'+'ate'+'it'='neverateit'
'neverateit' anagrammed gives 'INVETERATE'.

Can you help me to learn more?

(Other definitions for inveterate that I've seen before include "Firmly established by usage or custom" , "Hardened" , "Long-formed (bad habit)" , "Confirmed in (bad) habit" , "Habitual" .)

I've seen this clue in The Globe and Mail.

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