Crossword Genius

Composer badly taken aback after opening of music omitted (7)

Ross

I believe the answer is:

corelli

'composer' is the definition.
(Arcangelo Corelli)

I don't understand the remainder of the clue.

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

I've seen this clue in The Times.
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