Spoiled skinned fish (5)
I believe the answer is:
angle
'fish' is the definition.
(angle can mean to fish)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for angle that I've seen before include "Approach to problem" , "Fish; viewpoint" , "Gradient" , "Corner - fish" , "old invader" .)