Crossword Genius

Strong fortress (7)

Ross

I believe the answer is:

citadel

(Other definitions for citadel that I've seen before include "Fortress overlooking a city" , "Highly-secure building" , "Structure in place to protect" , "Stronghold usually within the walls" , "Fortress (in or near city)" .)

I've seen this clue in The Times and the Universal.
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