A rotter, but with a nice skin (5)
I believe the answer is:
snake
This clue could be a double definition.
'a rotter' is the first definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'with a nice skin' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'but' acts as a link.
Can you help me to learn more?
(Other definitions for snake that I've seen before include "Entertainer with music and reptiles" , "Move sinuously" , "Limbless reptile" , "Asp, perhaps?" , "former EC currency band" .)