Pierce the skull (6)
I believe the answer is:
trepan
(Other definitions for trepan that I've seen before include "Make a hole in skull" , "Surgical saw" , "Skull borer" , "cut through bone" , "Make perforation in person's skull" .)
I believe the answer is:
trepan
(Other definitions for trepan that I've seen before include "Make a hole in skull" , "Surgical saw" , "Skull borer" , "cut through bone" , "Make perforation in person's skull" .)