Composer of large variations (5)
I believe the answer is:
elgar
'composer' is the definition.
(Edward Elgar)
'large variations' is the wordplay.
'variations' indicates anagramming the letters.
'large' with letters rearranged gives 'ELGAR'.
'of' acts as a link.
(Other definitions for elgar that I've seen before include "Scorer" , "The 18 [APOSTLES] creator" , "Enigma Variations composer" , "Score-person" , "Glare at composer of 'The Dream of Gerontius'" .)