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Astound the keen violinist? (4,4)

Ross

I believe the answer is:

bowl over

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'astound' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for bowl over that I've seen before include "Greatly surprise" , "Thoroughly delight" , "Deliver six balls on the cricket pitch" , "wow" , "Greatly impress" .)

I've seen this clue in the Evening Standard.
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