Crossword Genius

French port whose name Queen Mary declared would be found written on her heart when she died (6)

Ross

I believe the answer is:

calais

(Other definitions for calais that I've seen before include "Nearest French port to England" , "French port opposite Dover" , "A ferry port in northern France" , "end of the tunnel" , "French Channel port" .)

I've seen this clue in The Independent.
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