23 across
Like
stage
performance
with
old
piano
–
unpredictable,
not
right
(8)
Like stage performance with old piano – unpredictable, not right (8)
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The definition is at the beginning of the clue.
How the clue works
The definition is Like stage performance — think opera. For the wordplay, old gives you O, piano gives you P (as in musical notation), and then unpredictable points to ERRATIC, but not right means you drop the R, leaving ERATIC. String them all together and there's your answer.