Prisoner's means of communication curtailed by committee's conclusion (8)

I believe the answer is:

internee

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'prisoner's' is the definition.
(internee is a kind of prisoner)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for internee that I've seen before include "suspected terrorist" , "Imprisoned person" , "Alien confined in war" , "One is held without trial" , "Detainee" .)

I've seen this clue in The Independent.

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