Tangles (6)
I believe the answer is:
snarls
'tangles' is the definition.
('snarl' can be a synonym of 'tangle')
This is the entire clue.
(Other definitions for snarls that I've seen before include "Growls fiercely or tangles up" , "Growls angrily with bared teeth" , "Growls of an angry dog" , "Growls angrily, or tangles" .)