Morays or congers? (4)
I believe the answer is:
eels
This clue is a double definition.
'morays' is the first definition.
(I've seen this in another clue)
'congers?' is the second definition.
(conger is a kind of eel)
(Other definitions for eels that I've seen before include "Elongated fish" , "Congers" , "Devious types" , "Abstract nineteen sixties style" , "Slippery creatures" .)