Indonesian dagger (4)
I believe the answer is:
kris
'indonesian dagger' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for kris that I've seen before include "showing blade" , "Malayan slashing knife" , "Malay knife" , "Malaysian knife with a scalloped edge" , "Malay dagger - for Kristofferson?" .)