German water found in Amstel beer (4)

I believe the answer is:

elbe

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'german water' is the definition.
The definition suggests a singular noun which matches the answer.

'in amstel beer' is the wordplay.
'in' indicates a hidden word.
'ELBE' can be found hidden inside 'amstel beer'.

'found' acts as a link.

Can you help me to learn more?

(Other definitions for elbe that I've seen before include "Dresden and Hamburg's river" , "It flows through Germany" , "Dresden/Hamburg river" , "European river" , "River of Germany" .)

I've seen this clue in The Times.

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