Go kaput, with "out" (4)
I believe the answer is:
conk
'go kaput with out' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for conk that I've seen before include "(Slang) nose - head" , "Nose; break down" , "Punch" , "Informal term for the nose" , "Nose, head (sl.)" .)