It's still produced north of the border (6)

I believe the answer is:

scotch

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'north of the border' is the definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I can't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for scotch that I've seen before include "A drink; crush" , "Put an end to, say rumour" , "dish" , "Kill in Caledonia?" , "liquor" .)

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