Bogarde's knife (4)
I believe the answer is:
This could be a double definition.
'bogarde's' is the first definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?
'knife' is the second definition.
(dirk is a kind of knife)
Can you help me to learn more?
(Other definitions for dirk that I've seen before include "which might get one stuck in Highlands" , "Highland dagger" , "Duncan's killer?" , "Daggert" , "weapon" .)