A large barracks talked of in N African capital (7)

I believe the answer is:

algiers

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'n african capital' is the definition.
(capital of Algeria)

I can't explain the remainder of the clue.

(Other definitions for algiers that I've seen before include "North African capital" , "NW African capital" , "Capital city" , "N. African port" , "North African port" .)

I've seen this clue in The Times.

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