Support for administrative personnel (5)
I believe the answer is:
staff
I believe this clue is a double definition.
'support' is the first definition.
(thesaurus)
'administrative personnel' is the second definition.
(I've seen this before)
'for' is the link.
(Other definitions for staff that I've seen before include "the general's assistants recognised" , "crook" , "Rod - workforce" , "Group of employees and long stick for support" , "Personnel or wooden pole" .)