Makes a lengthy or pompous speech (6)
I believe the answer is:
orates
'makes a lengthy or pompous speech' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for orates that I've seen before include "Talks pompously" , "Talks grandly from a platform" , "Speaks formally, makes speech" , "Speechifies" , "Makes lengthy or pompous speech" .)