Shrewd bowman without any hesitation (4)

I believe the answer is:

arch

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

I cannot understand how the remainder of the clue works.

(Other definitions for arch that I've seen before include "Structural curve" , "architectural feature" , "Knowing, coy" , "Masonry structure for spanning an opening" , "Inner part of foot" .)

I've seen this clue in The Irish News.

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