Surgical knife (6)
'surgical knife' is the definition.
(lancet is a kind of surgical knife)
This is all the clue.
(Other definitions for lancet that I've seen before include "Pointed arch, window" , "Surgeon's instrument and journal" , "Sharp instrument" , "Pointed two-edged knife used by surgeon" , "provided cuttings" .)
'surgical knife' is the definition.
(I know that scalpel is a type of surgical knife)
This is all the clue.
(Other definitions for scalpel that I've seen before include "Surgical implement" , "Medical knife" , "Surgical instrument" , "Surgical tool" , "Theatrical knife?" .)