Organise (7)
'organise' is the definition.
(I know that organise is a more specific form of the action manage)
This is all the clue.
(Other definitions for manage that I've seen before include "Run (eg, company)" , "Be in charge of something" , "Handle, cope with" , "Contrive" , "Handle, oversee" .)
'organise' is the definition.
(arranging is a kind of organizing)
This is the entire clue.
(Other definitions for arrange that I've seen before include "Put in systematic order" , "Settle, work out" , "Fix" , "Dispose" , "Sort" .)