Coil of hair (7)
I believe the answer is:
chignon
'coil of hair' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for chignon that I've seen before include "Coil of hair at the back of the head" , "Hairstyle" , "Roll of hair worn at the nape" , "Roll of hair worn at the back of the head" , "Topknot" .)