Seizes faulty surplus laptop tossed out (6)

I believe the answer is:

usurps

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'seizes' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

(Other definitions for usurps that I've seen before include "Seizes wrongfully or by force" , "Arrogates" , "takes place" , "Encroaches upon" , "Takes power or position wrongfully" .)

I've seen this clue in the Sydney Morning Herald.

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