Mother of Kim, Kylie and Kourtney (4)

I believe the answer is:

kris

(Other definitions for kris that I've seen before include "Wavy-edged dagger" , "Malay dagger - for Kristofferson?" , "showing blade" , "Its flag has a maple leaf" , "Malaysian knife with a scalloped edge" .)

I've seen this clue in The New York Times.

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