7 down
Hopefully,
with
finale
from
tenor
to
replace
bass,
producing
calm
(2,4)
Hopefully, with finale from tenor to replace bass, producing calm (2,4)
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The definition is at the end of the clue.
How the clue works
calm is your definition here, meaning "at rest." Take AT BEST ("hopefully"), swap out the B ("bass") for R (the "finale from tenor," i.e. the last letter of "tenor"), and you've got your answer.