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