Lorne of "Bonanza" (6)
I believe the answer is:
greene
'lorne of bonanza' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for greene that I've seen before include "Graham -, twentieth century English author" , "Graham --, British author" , "Graham --, Eng. author" , "Graham -, English novelist" , "Graham -, English author (Brighton Rock)" .)