Snarl “Go away!” (3,7)
I believe the answer is:
get knotted
'snarl go away' is the definition.
I can't tell whether this definition defines the answer.
'go away' is the wordplay.
'go' becomes 'get' (synonyms).
'away' becomes 'knotted' (I am not sure about this - if you are sure you should believe this answer much more).
'get'+'knotted'='GET KNOTTED!'
Can you help me to learn more?
(Other definitions for get knotted that I've seen before include "express disapproval thus" , "Become entangled" , "What your muscles may do" , "on your bike" .)