Instruments producing pair of notes (11)

I believe the answer is:

pianofortes

'instruments' is the definition.
(pianoforte is a kind of instrument)

'producing pair of notes' is the wordplay.
'producing' indicates an anagram.
'pair'+'of'+'notes'='pairofnotes'
'pairofnotes' anagrammed gives 'PIANOFORTES'.

(Another definition for pianofortes that I've seen is " Keyboard instruments".)

I've seen this clue in the Best For Puzzles.

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