Moscow citadel (7)

I believe the answer is:

kremlin

'moscow citadel' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for kremlin that I've seen before include "fortress" , "Castle" , "Moscow landmark" , "Citadel of a Russian town" , "Historic fortified complex in the heart of Moscow" .)

I've seen this clue in The Telegraph and The Guardian.

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