"Psycho" co-star (5)
I believe the answer is:
leigh
'psycho co-star' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for leigh that I've seen before include "Town in NW England" , "Mike - - (film director)" , "See 17" , "Lancashire town" , "Vivien ---; --- Hunt" .)