Vehicle experiencing programming malfunction? (5)
I believe the answer is:
buggy
I believe this is a double definition.
'vehicle' is the first definition.
(buggy is a kind of vehicle)
'experiencing programming malfunction?' is the second definition.
(Other definitions for buggy that I've seen before include "Pushchair - small motorised vehicle" , "Small open motor vehicle; infested" , "A small vehicle as for baby" , "Of software, containing errors" , "Light horse-drawn vehicle; infested" .)