Bird repeatedly shaking wings in heat, ugly hen (5)

I believe the answer is:

eagle

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

I can't explain the rest of the clue.

(Other definitions for eagle that I've seen before include "high-flier" , "drugs with silver left inside" , "Bird - emblem of power" , "A glee-ful bird?" , "part of round that's exceptional" .)

I've seen this clue in The Telegraph.

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