Something incisive in the medical journal (6)

I believe the answer is:

lancet

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'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" .)

I've seen this clue in the Evening Standard.

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