Accomplish rupture with British withdrawing (5)

I believe the answer is:

reach

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'accomplish' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

(Other definitions for reach that I've seen before include "Arrive at a point" , "Get to; extent" , "Get as far as" , "Stretch of a river between two bends" , "Come to - stretch of river" .)

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