Coiled length of yarn (5)
I believe the answer is:
skein
'coiled length of yarn' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for skein that I've seen before include "Piece of loose-coiled yarn" , "Loosely coiled length of thread" , "Coiled length of yarn" , "Hank" , "Loose coil of yarn" .)