Possible Clues:

• Composer of "Pomp and Circumstance"
• Enigma Vars. composer
• Knighted British composer
• For this one might get a glare from the composer
• 'Chanson de Matin' composer
• Composer in anger starts to look back
• Nimrod composer
• Composer of regal variations
• 'The Severn Suite' composer
• Large variation produced enigma