A hole made by the boxer (6)

I believe the answer is:

crater

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

'a hole' is the definition.
(I've seen this before)

'by the boxer' is the wordplay.
I cannot really see how this works, but
'by' could be 'at' and 'at' is present in the answer.
This explanation may well be incorrect...

'made' acts as a link.

Can you help me to learn more?

(Other definitions for crater that I've seen before include "Volcano opening" , "Caldera" , "Capital of Virginia" , "Great hole as on top of volcano" , "Hole (on the moon?)" .)

I've seen this clue in the Evening Standard.

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