Coil of yarn (5)
I believe the answer is:
skein
'coil of yarn' 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" , "Clock face" , "Loosely-coiled bundle of wool" , "Flock on the move" , "Hank" .)