Composer buys a secluded complex (6,7)
I believe the answer is:
claude debussy
'composer' is the definition.
(I know that Claude Debussy has the occupation composer)
'buys a secluded complex' is the wordplay.
'complex' is an anagram indicator.
'buys'+'a'+'secluded'='buysasecluded'
'buysasecluded' anagrammed gives 'CLAUDE DEBUSSY'.
(Other definitions for claude debussy that I've seen before include "French composer, d. 1918" , "French musician" .)