A way of doing something (6)
I believe the answer is:
method
'a way of doing something' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for method that I've seen before include "particular procedure" , "Systematic way of doing something" , "Style of technique, as of some actors" , "Systematic procedure" , "Way of doing something, procedure" .)