To silence, incarcerate (4,2)

I believe the answer is:

shut up

I believe this is a double definition.

'to silence' is the first definition.
('shut up' can be a synonym of 'silence')

'incarcerate' is the second definition.
(thesaurus)

(Other definitions for shut up that I've seen before include "Enclose; be quiet!" , "in prison" , "say nothing" , "jail" , "Button it!" .)

I've seen this clue in the Evening Standard.

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