Composer, regal sort (5)

I believe the answer is:

elgar

'composer' is the definition.
(Edward Elgar)

'regal sort' is the wordplay.
'sort' indicates an anagram.
'regal' with letters rearranged gives 'ELGAR'.

(Other definitions for elgar that I've seen before include "[NIMROD] 's creator" , "Enigma Vars. composer" , "Score-person" , "He scored" , "Enigma Variations composer" .)

I've seen this clue in The Daily Express.

Want a hint initially instead of a full solution? Install my app