Old boxer spins to belt surrogate? (8)

I believe the answer is:

claytons

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'old boxer spins' is the definition.
I know nothing about this answer so I can't judge whether this works.

'to belt surrogate?' is the wordplay.
I cannot really see how this works, but
'to' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

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

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