We may hear lean composer (5)

I believe the answer is:

liszt

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'composer' is the definition.
(Franz Liszt)

I don't understand the rest of the clue.

(Other definitions for liszt that I've seen before include "Hungarian romantic composer" , "Franz . . . . ., 19th century Hungarian composer and pianist" , "Hungarian composer, d. 1886" , "music writer" , "Hungarian piano virtuoso, d. 1886" .)

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