Large triangular jib or foresail, often a feature of racing yachts (5)

I believe the answer is:

genoa

(Other definitions for genoa that I've seen before include "City of Italy" , "NW Italian sea port" , "Seaport in northwestern Italy" , "Italian city has no age, oddly" , "Cake type; foresail" .)

I've seen this clue in The Independent.

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