Fortress — Aldi etc (anag) (7)

I believe the answer is:

citadel

(Other definitions for citadel that I've seen before include "Stronghold (of the Salvation Army?)" , "Stronghold into which people could go for shelter during a battle" , "Urban fortress" , "Kremlin" , "place of refuge" .)

I've seen this clue in The Guardian.

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