Parts of a process (6)
I believe the answer is:
stages
'parts of a process' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for stages that I've seen before include "Coaches" , "Parts of route taken by bus" , "Sagest kind of play venues" , "Sagest venues for plays" , "Platforms on which plays are performed" .)