Entangle, as yarn (5)
I believe the answer is:
ravel
'entangle as yarn' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ravel that I've seen before include "Bolero's composer" , "He scored" , "Musician" , "Tangle - untangle - French composer, d. 1937" , "Make more complicated - French composer, d. 1937" .)