Pirate ship? (7)

I believe the answer is:

corsair

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But I can't explain it at all! Could you help me understand?

(Other definitions for corsair that I've seen before include "work by Verdi" , "Pirate from N. Africa" , "Seafarer" , "A swift pirate ship" , "Barbary pirate - pirate ship" .)

I've seen this clue in The Hindu.

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