It's truly hard to say if you're drunk (5)

I believe the answer is:

rural

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'drunk' is the definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I can't see?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for rural that I've seen before include "Old country fellow" , "Bucolic; pastoral" , "Connected with farming" , "covering the country" , "Cobbett saw on his rides?" .)

I've seen this clue in the Evening Standard.

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