Surgical cut (8)
I believe the answer is:
incision
'surgical cut' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for incision that I've seen before include "A river; a warrior" , "Cut made surgically into the body" , "A surgical cut into the body" , "Surgical ten across" , "Cut as made with surgeon's knife" .)