Begone! (6)
(Other definitions for scat that I've seen before include "Shoo!" , ""Beat It"" , "leave quickly" , "Style of jazz singing" , "Wordless singing style" .)
(Other definitions for shoo that I've seen before include "Sling your hook!" , "Buzz off!" , "told to go away!" , "Shove off!" , "Get away" .)
(Other definitions for avaunt that I've seen before include "Old word for be off" , "Shakespearian begone, move on" , "Go away (arch.)" , ""Get away!"" , "Anything but a welcoming word!" .)