Who may change a few notes for a grand (5)

I believe the answer is:

tuner

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'grand' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for tuner that I've seen before include "piano man?" , "Radio receiver" , "Motor specialist" , "Piano adjuster" , "Radio adjuster" .)

I've seen this clue in The Independent.

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