Some terrible mishap brings scar (7)
I believe the answer is:
blemish
'scar' is the definition.
(thesaurus)
'some terrible mishap brings' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'BLEMISH' is hidden within 'terrible mishap brings'.
(Other definitions for blemish that I've seen before include "Noticeable flaw" , "Flaw that spoils a thing's perfection" , "deformity" , "A flaw or imperfection" , "Moral defect or fault" .)