Detective probing dodgy organ and another keyboard instrument (5,5)

I believe the answer is:

grand piano

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'keyboard instrument' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for grand piano that I've seen before include "maker of notes?" , "One's three-legged" , "responsible for producing notes ..." , "Keyboard instrument" , "Large instrument with horizontal strings" .)

I've seen this clue in The Independent.

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