Series of steps (5)
'series of steps' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stair that I've seen before include "One of a 15" , "means to go down" , "something of a case" , "one on the way up" , "Tarsi (anag)" .)
(Other definitions for operation that I've seen before include "performance" , "Theatre procedure" , "Manoeuvre - military action" , "financial transaction" , "Surgical or military procedure" .)
'series of steps' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for process that I've seen before include "The case" , "move in train" , "Deal with in a routine way" , "Course of action intended to achieve a result" , "Move in formation" .)