Gadget ( Informal ) (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
gizmo
(Other definitions for gizmo that I've seen before include "Ingenious device; gadget" , "Gadget, thingamajig" , "Thingamabob, gadget" , "Device or control that is very useful for a particular job" .)