Growl at tangle (5)
I believe the answer is:
snarl
This clue is a double definition.
'growl' is the first definition.
(I've seen this before)
'tangle' is the second definition.
(I know that tangle can be written as snarl)
'at' acts as a link.
(Other definitions for snarl that I've seen before include "Growl viciously" , "Show one's teeth (like a lion)" , "(Make an) aggressive noise" , "Growl in a threatening manner" , "Growl aggressively" .)