Crossword Genius

One serving drink? One leaving drink? (5)

Ross

I believe the answer is:

water

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This could be a double definition.

'one serving drink?' is the first definition.
'water' can be an answer for 'drink?' (water is an example). I am not sure about the 'one serving' bit.

'one leaving drink?' is the second definition.
'water' can be an answer for 'drink?' (water is an example). I am unsure of the 'one leaving' bit.

Can you help me to learn more?

(Other definitions for water that I've seen before include "Compound of hydrogen and oxygen" , "Diamond quality" , "It's to be found in puddles, pools and ponds" , "Gem quality; fluid" , "What can produce solution" .)

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