Sushi fish
I believe the answer is:
eel
'sushi fish' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for eel that I've seen before include "Evasive type" , "Teleost fish" , "Sea creature like conger" , "Proverbially slippery fish" , "Snakelike fish" .)