Crossword Genius

A gaggle of high-fliers (5)

Ross

I believe the answer is:

skein

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'a gaggle' is the definition.
(thesaurus)

I don't understand how the rest of the clue works.

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(Other definitions for skein that I've seen before include "Coil of wool - flock of geese" , "Loosely coiled length of thread" , "Loosely coiled bundle of wool" , "Loose bundle of yarn" , "Flock of flying geese" .)

I've seen this clue in the Evening Standard.
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