Singer-actor Kristofferson (4)
I believe the answer is:
kris
'singer-actor kristofferson' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for kris that I've seen before include "Malayan dagger" , "Indonesian dagger; sounds like fold" , "Malay dagger - for Kristofferson?" , "-- Kringle, Santa Claus" , "showing blade" .)