Brutal person (5)
(Other definitions for beast that I've seen before include "Inhuman person" , "Traditional poet" , "wild creature" , "Pig" , "rotter" .)
(Other definitions for animal that I've seen before include "Living organism characterised by voluntary movement" , "I''m Alan (anag) - a wild, crazy person" , "One sharing our kingdom" , "lamb, perhaps" , "Man or beast" .)