Piece of music that's short, to a greater extent in audition (7)

I believe the answer is:

morceau

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'piece of music that's short' is the definition.
(short piece of music)

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

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(Other definitions for morceau that I've seen before include "piece of music" , "Fragment, morsel (French); EC amour (anag.)" , "Mime artist" , "Fragment; short literary composition" .)

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