Something incisive in the medical journal (6)
I believe the answer is:
lancet
'journal' is the definition.
(I know that Lancet is a journal)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for lancet that I've seen before include "Sharp instrument" , "Surgical instrument" , "Surgeon's tool" , "Pointed two-edged knife used by surgeon" , "Pointed arch, window" .)