Walks stiffly when final cricket ball has been delivered (6)

I believe the answer is:

stumps

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'walks' is the definition.
(stumping is a kind of walking)

I cannot understand how the remainder of the clue works.

(Other definitions for stumps that I've seen before include "Baffles -- projecting remnants" , "End of play" , "(In cricket) close of play" , "The upright sticks in cricket wicket" , "Baffles with cricket sticks?" .)

I've seen this clue in The Telegraph.

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