Crossword Genius

Main malt whisky distiller picked up legally empowered US citizen (5,5)

Ross

I believe the answer is:

grand juror

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'main' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

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I've seen this clue in The Guardian.
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