Crossword Genius

Home of St Catherine, they say: d'you know her? (5)

Ross

I believe the answer is:

genoa

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'home of st catherine' is the definition.

I don't understand the remainder of the clue.

Can you help me to learn more?

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

I've seen this clue in The Everyman puzzle in The Observer.
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