Slippery fish (3)

I think it could be either:

Which length description are you looking for?:

eel

'slippery fish' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for eel that I've seen before include "Slender fish" , "Snake-like sea creature" , "Snaky fish" , "Electric swimmer, perhaps?" , "Slippery swimmer (may be jellied)" .)

I've seen this clue in The Mirror, the USA Today, the Evening Standard, The Star Tribune, the Newsday, the Penny Press, The Guardian, The Telegraph, The New York Times, the Universal and The Times.

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