2 down
Performing
one
piece
that’s
old?
(2,1,3)
Performing one piece that’s old? (2,1,3)
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The definition is at the end of the clue.
How the clue works
The definition is that's old?, since being "on a bit" (as in getting on a bit) means being old. The wordplay is a charade: ON (performing) + A (one) + BIT (piece).