Crossword Genius

Polish melody that’s very good? (4-4)

Ross

I believe the answer is:

fine-tune

'polish' is the definition.
(both can mean to perfect or add finishing touches)

I can't explain the rest of the clue.

(Other definitions for fine-tune that I've seen before include "Make small adjustments (to)" , "Improve, making small adjustments" .)

I've seen this clue in The Times.
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