You've got me skinned - it hurts! (4)
I believe the answer is:
ouch
'it hurts' is the definition.
(both might be said when in pain)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for ouch that I've seen before include "Pained exclamation" , "response to a bad pun" , "Exclamation of pain - that hurt!" , "sounds painful" , "Pained expression" .)