Bates of "Psycho" (6)
I believe the answer is:
norman
'bates of psycho' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for norman that I've seen before include "Old invader" , "Australian golfer" , "Style of architecture" , "1066 invader" , "10th century French settler ..." .)