Flow revealed by Daniel Bernouilli (4)

I believe the answer is:

elbe

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'flow' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

'revealed by daniel bernouilli' is the wordplay.
'revealed by' indicates the answer is hidden within the clue.
'ELBE' can be found hidden inside 'daniel bernouilli'.

Can you help me to learn more?

(Other definitions for elbe that I've seen before include "Dresden and Hamburg's river" , "River flowing through Dresden and Hamburg" , "German banker" , "Current" , "A major German river" .)

I've seen this clue in The Times.

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