Bird seen when others rise (4)

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.

(Other definitions for skua that I've seen before include "Seabird; sounds like pin" , "Large sea bird" , "Gull-like rapacious bird" , "Large predatory bird" , "Craziness" .)

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

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