Confessed to premeditated disruption when peer disappears... (8)

I believe the answer is:

admitted

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'confessed' is the definition.
(synonyms)

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

(Other definitions for admitted that I've seen before include "Owned up or let in" , "being given access" , "Confessed; let in" , "Allowed in or accepted as true" , "taken into hospital" .)

I've seen this clue in The Irish Times.

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