Flamboyance (5)
'flamboyance' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for ostentation that I've seen before include "show" , "Showiness" , "Pretentious display" .)
'flamboyance' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eclat that I've seen before include "French social distinction or success" , "Ostentation" , "Brilliance" , "Brilliant display -- conspicuous success" , "Cleat (anag.)" .)