Crossword Genius

Can such friends get drunk on milk? (5)

Ross

I believe the answer is:

stout

I'm a little stuck... Click here to teach me more about this clue!

'milk?' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Maybe there's a link between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for stout that I've seen before include "Bulky" , "Inured to fatigue and hardship" , "Portly - porter" , "Corpulent" , "Heavily built; beer" .)

I've seen this clue in the Evening Standard.
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