Fetching details from the dictionary...

device; contrivance; mechanism; gadget
trick; trap; calculated manipulation; gambit
(small) scale; half finished
commencement; initiation
set up; laying out; preparation
challenge; attack
この箱には秘密の仕掛けが隠されている。
A secret mechanism is hidden inside this box.
犯人の巧妙な仕掛けを刑事が見抜いた。
The detective saw through the criminal's clever trick.
舞台の仕掛けが観客を驚かせる演出だった。
The stage mechanism was a production that surprised the audience.