Man who composed Harlem Shuffle (6)

I believe the answer is:

mahler

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'man who composed' is the definition.
The definition suggests a singular noun which matches the answer.

'harlem shuffle' is the wordplay.
'shuffle' indicates an anagram.
'harlem' with letters rearranged gives 'MAHLER'.

Can you help me to learn more?

(Other definitions for mahler that I've seen before include "Gustave ......, noted Austrian composer-conductor" , "Vienna and New York opera conductor" , "Harlem (anag) - composer" , "Interrupt; hang" , "Gustav -, Austrian symphonist" .)

I've seen this clue in The Irish Times.

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