Is such broth alcoholic? (6)
I believe the answer is:
scotch
'alcoholic?' is the definition.
Both the definition and answer are adjectives. Maybe you can see an association between them that I can't see?
I cannot understand how the rest of the clue works.
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" .)