Wow, is it someone mad keen on archery? (4,4)

I believe the answer is:

bowl over

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

I don't understand how the remainder of the clue works.

(Other definitions for bowl over that I've seen before include "Deliver six balls on the cricket pitch" , "Thoroughly delight" , "Greatly impress" , "Slay" , "Overwhelm with surprise or emotion - at cricket?" .)

I've seen this clue in The Telegraph.

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