Plot in Greene novel (8)
I believe the answer is:
engineer
'plot' is the definition.
(I've seen this before)
'in greene novel' is the wordplay.
'novel' is an anagram indicator.
'in'+'greene'='ingreene'
'ingreene' with letters rearranged gives 'ENGINEER'.
(Other definitions for engineer that I've seen before include "Design and build" , "Practical technologist" , "Effect this professional man" , "Mechanic" , "Plot" .)