Duck pirate aboard the Jolly Roger (4)

I believe the answer is:

smee

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'duck' is the definition.
(type of duck)

I cannot understand how the rest of the clue works.

(Other definitions for smee that I've seen before include "pirate > BIRD" , "Peter Pan pirate" , "Literary pirate" , "Hook's bo'sun (Peter Pan)" , "Captain Hook's mate" .)

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