Geese you simply have to look up to (5)

I believe the answer is:

skein

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'geese you' is the definition.
The definition suggests a singular noun which matches the answer.

I can't explain the remainder of the clue.

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(Other definitions for skein that I've seen before include "Loosely coiled bundle of wool" , "Group of geese in flight" , "Loosely coiled length of thread" , "Coil of wool - flock of geese" , "Loosely-coiled bundle of wool" .)

I've seen this clue in the Evening Standard.

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