Knighted composer (5)
I believe the answer is:
elgar
'knighted 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 "Glare at composer of 'The Dream of Gerontius'" , "Land of Hope and Glory composer" , "Glare at great English composer" , "Enigma Variations composer" , "The 18 [APOSTLES] creator" .)