Mistake shown in management? (9)
I believe the answer is:
oversight
I believe this clue is a double definition.
'mistake' is the first definition.
(oversight is a kind of mistake)
'management?' is the second definition.
(oversight is a kind of management)
'shown in' is the link.
(Other definitions for oversight that I've seen before include "Lapse" , "Innocent mistake" , "Neglect" , "A failure to notice, an omission" , "Failure to notice - supervision" .)