Crossword Genius

River flowing though Heidelberg? (4)

Ross

I believe the answer is:

elbe

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

'river' is the definition.
(river in Germany)

'flowing though heidelberg?' is the wordplay.
'ELBE' is hidden within the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for elbe that I've seen before include "Dresden and Hamburg's river" , "European river" , "A major German river" , "Current" , "It flows through Germany" .)

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