Crossword Genius

Slippery, but they can be trapped (4)

Ross

I believe the answer is:

eels

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(Other definitions for eels that I've seen before include "Slithery fish" , "Devious types" , "Fish (that may be jellied)" , "Smooth fishes" , "eg Conger" .)

I've seen this clue in the Evening Standard.
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