Crossword Genius

Alvin's or Ziggy's magical quality? (8)

Ross

I believe the answer is:

stardust

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'magical quality?' is the definition.

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

Can you help me to learn more?

(Other definitions for stardust that I've seen before include "In Woodstock we are this" , "that could blind one to reality" , "Imaginary particles blinding someone to reality" , "Singer < and song" .)

I've seen this clue in The Sun.
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