Crossword Genius

Sing a rude song on a pirate ship (7)

Ross

I believe the answer is:

corsair

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'pirate ship' is the definition.
(corsair is a kind of pirate ship)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for corsair that I've seen before include "Pirate (archaic)" , "Pirate from N. Africa" , "Barbary pirate - pirate ship" , "Seafarer" , "Marauder" .)

I've seen this clue in the Sydney Morning Herald.
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