Crossword Genius

Perforation, with central piece removed, ruined early keyboard instrument (10)

Ross

I believe the answer is:

fortepiano

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'keyboard instrument' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for fortepiano that I've seen before include "keyboard instrument" , "Old source of music" .)

I've seen this clue in The Independent.
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