Hank of yarn (5)
I believe the answer is:
skein
'hank of yarn' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for skein that I've seen before include "Loosely coiled length of thread" , "Flight of birds" , "Group of geese in flight" , "Loosely coiled bundle of wool" , "Loose coil of yarn" .)