Put something through a series of stages (9)
I believe the answer is:
processed
'put something through a series of stages' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for processed that I've seen before include "Put something through a series of stages" , "Dealt with, moved things along" , "Put something through a series of operations" , "Put a product through a series of stages" , "Refined (of food)" .)