Slippers in baskets, hiding first pair (4)
I believe the answer is:
eels
'slippers' is the definition.
Although both the answer and definition are plural nouns, I don't see how they can define each other.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for eels that I've seen before include "Slender fish" , "Sea creatures found in lees" , "eg Conger" , "Jellied --, traditional dish" , "Long fishes" .)