"Pomp and Circumstance" composer (5)
I believe the answer is:
elgar
'pomp and circumstance composer' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for elgar that I've seen before include "Score-person" , "Enigma Variations composer" , "Sir Edward -, English composer" , "[NIMROD] 's creator" , "British composer, d. 1934" .)