Pageantry (4)
I believe the answer is:
'pageantry' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pomp that I've seen before include "Vainglory" , "Ceremonial grandeur" , "Boastful display" , "Ceremonial elegance and splendour" , "Self-importance" .)