"Enigma Variations" composer
I believe the answer is:
'enigma variations 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 "Nimrod composer" , "[NIMROD] 's creator" , "He scored" , "Out of the strange glare comes an English composer" , "Scorer" .)