Flier strung up? (4)

I believe the answer is:

kite

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'flier' is the definition.
(kite is a kind of birdanimal)

I cannot understand how the remainder of the clue works.

(Other definitions for kite that I've seen before include "Soaring bird of prey" , "Light frame toy held on a string - bird of prey" , "Flying toy on a string" , "It's flown in the wind at the end of a string" , "It flies with string attached" .)

I've seen this clue in the Evening Standard.

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