Sign of having stopped bleeding (4)
I believe the answer is:
scar
'sign' is the definition.
(I have seen 'Sign of injury ' mean 'scar' so perhaps 'sign' could also mean 'scar')
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for scar that I've seen before include "Old wound - bare cliff" , "Sign of old injury" , "Mark of old injury" , "reef" , "Evidence of an old injury" .)