Stan maybe rejected slippery character (3)
I believe the answer is:
eel
'slippery character' is the definition.
(slippery fish)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for eel that I've seen before include "User of electric organ" , "Almost scaleless fish" , "Wriggly fish" , "Slippery type" , "Slippery figure" .)