Slippery as an __ (3)

I believe the answer is:

eel

(Other definitions for eel that I've seen before include "Slippery type" , "Serpentine fish" , "Unagi, in a sushi bar" , "Apode" , "Ribbon-like fish" .)

I've seen this clue in The Washington Post, the USA Today, the Penny Press, the Newsday and the L.A. Times Daily.

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