Geese in flight (5)
I believe the answer is:
skein
'geese in flight' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for skein that I've seen before include "Loosely coiled length of thread" , "Ball of yarn" , "Loosely coiled bundle of wool" , "Coil of yarn - group of flying geese" , "Coil of wool - flock of geese" .)