Regal composer? (5)

I believe the answer is:

elgar

I'm a little stuck... Click here to teach me more about this clue!

'regal composer?' is the definition.
'elgar' can be an answer for 'composer?' (Edward Elgar). I'm unsure of the 'regal' bit.

'regal composer?' is the wordplay.
'composer?' indicates anagramming the letters (I've seen 'composer' mean this).
'regal' is an anagram of 'ELGAR'.

Can you help me to learn more?

(Other definitions for elgar that I've seen before include "Composer of Pomp and Circumstance marches, d. 1934" , "Sir Edward -, English composer" , "Nimrod composer" , "Out of the strange glare comes an English composer" , "Score-person" .)

I've seen this clue in the Evening Standard.

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