Functioning (7)
'functioning' is the definition.
('work' can be a synonym of 'function')
This is the entire clue.
(Other definitions for working that I've seen before include "Operating" , "Employed" .)
(Other definitions for operative that I've seen before include "secret agent" , "undercover agent" , "Significant" , "Working (person)" , "Having force - skilled worker" .)
'functioning' is the definition.
('operate' can be a synonym of 'function')
This is all the clue.
(Other definitions for operating that I've seen before include "Active" , "Functioning" , "at work" , "(Of machine) running" , "Cutting" .)