Is such broth alcoholic? (6)

I believe the answer is:

scotch

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'alcoholic?' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for scotch that I've seen before include "Prevent -- frustrate" , "hard drink" , "providing nursery facility in school" , "See 1" , "A short" .)

I've seen this clue in the Evening Standard.

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