We hear a vulgar song from this pirate (7)

I believe the answer is:

corsair

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'this pirate' is the definition.
(I know that corsair is a type of pirate)

I don't understand the remainder of the clue.

(Other definitions for corsair that I've seen before include "Pirate from N. Africa" , "20 across" , "Buccaneer" , "work by Verdi" , "Privateer" .)

I've seen this clue in The Globe and Mail.

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