Cover or uncover (4)
I believe the answer is:
skin
'cover' is the definition.
(I know that skin is a type of cover)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for skin that I've seen before include "External membrane of body" , "Flense" , "Outer surface" , "Remove the outer layer" , "What keeps you in" .)