Way or system (6)
I believe the answer is:
method
I believe this is a double definition.
'way' is the first definition.
(method is a kind of way)
'system' is the second definition.
(I've seen this before)
(Other definitions for method that I've seen before include "Style of technique, as of some actors" , "Type of acting" , "Systematic way of doing something" , "Way of doing something, perhaps in madness" , "'Means, way of achieving (6)'" .)