Nietzsche meant to hide plot (6)
I believe the answer is:
scheme
'plot' is the definition.
(I know that scheme is a type of plot)
'nietzsche meant to hide' is the wordplay.
'to hide' indicates the answer is hidden within the clue.
'SCHEME' is hidden within 'nietzsche meant'.
(Other definitions for scheme that I've seen before include "Connive, intrigue" , "Systematic plan, plot" , "Plot, plan secretly" , "Plan, ruse" , "Wheel and deal" .)