Italian composer of the Baroque (7)
I believe the answer is:
corelli
(Other definitions for corelli that I've seen before include "A mandolin-playing Captain" , "Arcangelo, seventeenth to eighteenth century Italian composer, violinist" , "Captain -'s Mandolin (de Bernires)" , "Arcangelo --, Italian baroque composer" , "Marie - - , romantic 17" .)