Broken, not working (5)
I believe the answer is:
kaput
I believe this is a double definition.
'broken' is the first definition.
(I've seen this before)
'not working' is the second definition.
(kaput can mean broken)
(Other definitions for kaput that I've seen before include "Bust" , "No longer functioning" , "Broken - no longer working" , "Broken down irretrievably" , "Conked out" .)