French island in the Mediterranean Sea just north of the Italian island of Sardinia (7)

I believe the answer is:

corsica

(Other definitions for corsica that I've seen before include "Napoleon's birth island" , "Mediterranean island, birthplace of Napoleon" , "Mediterranean island, chief city Ajaccio" , "Napoleon's island birthplace" , "Island of W Italy, capital Ajaccio" .)

I've seen this clue in The Independent.

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