Ground-breaking device unaffected by revolution? (9)

I believe the answer is:

rotavator

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'ground-breaking device unaffected' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'by revolution?' is the wordplay.
I cannot really understand how this works, but
'by' could be 'at' and 'at' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

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I've seen this clue in The Independent.

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