Management blunder (9)
I believe the answer is:
oversight
I believe this is a double definition.
'management' is the first definition.
(overseeing something)
'blunder' is the second definition.
(thesaurus)
(Other definitions for oversight that I've seen before include "Supervisor's charged with this" , "Inadvertent mistake" , "what supervisor has" , "Failure to notice - supervision" , "error" .)