Crossword Genius

Shut up adolescent losing vacuous argument (6)

Ross

I believe the answer is:

immure

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'shut' is the definition.
(thesaurus)

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(Other definitions for immure that I've seen before include "Sketches" , "Confine; wall in" , "Imprison, shut in" , "Confine in a closed space" , "Enclose within walls, incarcerate" .)

I've seen this clue in The Telegraph.
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