A word about Solzhenitsyn's Archipelago (5)

I believe the answer is:

gulag

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'solzhenitsyn's archipelago' is the definition.
(I've seen this in another clue)

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(Other definitions for gulag that I've seen before include "Labour administration" , "where state's enemies were held" , "System of detention camps in former Soviet Union" , "Soviet prison camps" , "Russian prison and labour camp organisation" .)

I've seen this clue in the Evening Standard.

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