An undisciplined career, it seems, is only natural (4,4)

I believe the answer is:

wild life

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'it seems is only natural' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'an undisciplined career' is the wordplay.
'an undisciplined' becomes 'wild' (I've seen this in another clue).
'career' becomes 'life' (career can mean someone's life or past).
'wild'+'life'='WILD LIFE'

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