Crossword Genius

Bird or birds sent north (4)

Ross

I believe the answer is:

skua

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'bird' is the definition.
(skua is a kind of bird)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for skua that I've seen before include "Seabird; sounds like pin" , "Large predatory seabird" , "Predatory northern seabird" , "Large brown seabird" , "Flyer" .)

I've seen this clue in The Independent.
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