Instrument associated with the company Steinway & Sons (5)

I believe the answer is:

piano

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'instrument' is the definition.
(I know that piano is a type of stringed instrument)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for piano that I've seen before include "Clavier" , "Softly, musically speaking" , "key holder" , "entertain with this softly" , "Opposite of forte" .)

I've seen this clue in The Times.

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