Ancient citadel of Athens (9)

I believe the answer is:

acropolis

'ancient citadel of athens' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for acropolis that I've seen before include "Athens landmark" , "Large old building" , "Ancient citadel of Athens" , "old citadel" , "Parthenon location" .)

I've seen this clue in The Irish Times.

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