"Brigg Fair" composer (6)
I believe the answer is:
delius
(Other definitions for delius that I've seen before include "Frederick -, composer of Sea Drift, Appalachia" , "Frederick -, Brigg Fair composer" , "Frederick -, nature-inspired Eng. composer" , "English orchestral composer, d. 1934" , "English composer, Frederick (1862-1934)" .)