... by all means, but averse to use by all (10)

I believe the answer is:

absolutely

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

'by all means' is the definition.
(thesaurus)

'averse to use by all' is the wordplay.
'to use by all' can be anagrammed to 'ABSOLUTELY'.
However, I am not sure how this is indicated.

'but' acts as a link.

Can you help me to learn more?

(Other definitions for absolutely that I've seen before include "I wholly agree!" , "Yes, indeed!" , "Utterly" , "Dead" , "You bet!" .)

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

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