High-flyer’s frivolous escapade (4)

I believe the answer is:

lark

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'escapade' is the definition.
(I know that escapade can be written as lark)

I can't explain the rest of the clue.

(Other definitions for lark that I've seen before include "Frolic - songbird" , "Bird that sings on the wing" , "bit of mischief" , "Amusing escapade; bird" , "Game - bird" .)

I've seen this clue in The Times.

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