Crossword Genius

Instrument needing tuning, though not originally (4)

Ross

I believe the answer is:

harp

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'instrument' is the definition.
(harp is a kind of instrument)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for harp that I've seen before include "Heavenly instrument?" , "Traditional Gaelic musical instrument" , "Lyre" , "Chordophone" , "Stick to one theme" .)

I've seen this clue in The Telegraph.
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