Sushi supplies (4)
I believe the answer is:
eels
'sushi supplies' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eels that I've seen before include "Slippery creatures" , "Sea creatures found in lees" , "Snakes found in lees" , "Water snakes twisting in lees" , "Slippery types" .)