Crossword Genius

Related to sacred things, like whiskey? (9)

Ross

I believe the answer is:

spiritual

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'related' is the definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?

I cannot understand how the remainder of the clue works.

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(Other definitions for spiritual that I've seen before include "Of things of the soul" , "Relating to the soul rather than the body" , "Sacred - Black American religious song" , "Relating to religion" , "Relating to the holy or divine" .)

I've seen this clue in the Sydney Morning Herald.
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