Fine cord (6)
I believe the answer is:
thread
'fine cord' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for thread that I've seen before include "Line of cotton - plot (of book, film)" , "Dearth of sewing material" , "Filament; connecting link" , "Hatred (anag)" , "Length of spun cotton or wool" .)