Bird that’s flown as an experiment (4)

I believe the answer is:

kite

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

I can't explain the remainder of the clue.

(Other definitions for kite that I've seen before include "Plaything flown in the wind" , "Kind of toy flown on string" , "Toy flown at the end of a string" , "Light frame toy held on a string - bird of prey" , "flyer" .)

I've seen this clue in The Times.

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