One serving drinks spills one drink (5)

I believe the answer is:

water

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

'one drink' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for water that I've seen before include "Lake or river" , "Commonest liquid" , "Common liquid" , "Compound of hydrogen and oxygen" , "What can produce solution" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.