26 across
Soprano,
working
with
a
tenor
and
alto,
produces
music
(6)
Soprano, working with a tenor and alto, produces music (6)
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The definition is at the end of the clue.
How the clue works
Music is your definition here. Then it's a straightforward build-up: S for soprano, ON meaning working, A (just the letter "a"), T for tenor, and finally A for alto — stack them up and there's your answer.