Grandiloquent (7)
I believe the answer is:
orotund
'grandiloquent' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for orotund that I've seen before include "Loud or pompous" , "Sonorous; pompous" , "Of speech, dignified and pompous" , "Full, clear and musical" , "Pompous (in style)" .)