Administration or organisation (10)
I believe the answer is:
management
I believe this clue is a double definition.
'administration' is the first definition.
(I know that management is a type of administration)
'organisation' is the second definition.
(I know that management is a type of organisation)
(Other definitions for management that I've seen before include "board" , "Those in control of an organisation" , "Person employed to improve organisational efficiency" , "Those running company" , "The bosses" .)