Arranged grandiose transformation (9)
I believe the answer is:
organised
'arranged' is the definition.
(organising is a kind of arranging)
'grandiose transformation' is the wordplay.
'transformation' indicates anagramming the letters.
'grandiose' with letters rearranged gives 'ORGANISED'.
(Other definitions for organised that I've seen before include "fixed up" , "Set up,mobilised" , "Set up, mobilised" , "Put in order" , "Arranged - structured" .)