Crossword Genius

Fortified building (7)

Ross

I believe the answer is:

citadel

(Other definitions for citadel that I've seen before include "Stronghold into which people could go for shelter during a battle" , "Fortress (in or near city)" , "Highly-secure building" , "secure place" , "Structure in place to protect" .)

I've seen this clue in The Daily Mail and the Evening Standard.
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