Fish in the Elbe (3)

I believe the answer is:

eel

'fish' is the definition.
(eel is a kind of fish)

'in the elbe' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EEL' is hidden in the letters of 'the elbe'.

(Other definitions for eel that I've seen before include "Almost scaleless fish" , "Large elver" , "Creature like conger or moray" , "Unagi, in a sushi bar" , "Slippery creature" .)

I've seen this clue in the Evening Standard and The Guardian.

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