A season fixed by a form of athletic turnover (9)

I believe the answer is:

summerset

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'a form of athletic turnover' is the definition.
I can't judge whether this definition defines the answer.

'a season fixed by' is the wordplay.
'a season' becomes 'summer' (summer is a season).
'fixed' becomes 'set' (both can mean decided or determined).
'by' says to put letters next to each other.
'summer'+'set'='SUMMERSET'

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

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