Distinguished bowler briefly is worn by very old composer (6)

I believe the answer is:

dvorak

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'composer' is the definition.
(I know that Dvorak is a composer)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for dvorak that I've seen before include "Antonin ......, 19th century Czech composer of New World Symphony" , "Czech musician" , "One who composed" , "Antonin ------, Bohemian composer" , "keyboard" .)

I've seen this clue in The Telegraph.

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