"Psycho" psycho (6)
I believe the answer is:
norman
'psycho 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 "Attacker" , "Old invader" , "French dialect" , "- Mailer, US author" , "Sir - - Hartnell" .)