Israeli port, last city held by the Crusaders until 1291 (4)

I believe the answer is:

acre

(Other definitions for acre that I've seen before include "once occupied by Crusaders" , "Imperial unit of area" , "Care about this bit of land" , "4840 sq yds" , "Unit of area of 4,840 square yards" .)

I've seen this clue in The Guardian.

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