Surly growl (5)
I believe the answer is:
snarl
'surly growl' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for snarl that I've seen before include "Growl in a threatening manner" , "Entangle wool - show displeasure" , "Growl aggressively" , "A vicious angry growl" , "Tangle; growl" .)