A device that very useful for a particular job
Else clues • Gremlins gremlin voiced by Howie Mandel
• Contraption
• Doodad
• Doohickey
• Gadget
• Thingamabob
• Thingamajig
• Thingy
• Whatchamacallit
• Whatsis
• Something whose name is either forgotten or not known