The term SPYING AID is composed of two crossword solutions: CAM (3 letters) and MINIATURECAMERA (15 letters). CAM stands for Closed-Circuit Television, which is a type of surveillance camera that transmits video signals to a specific place. MINIATURECAMERA refers to a small camera that can be used for covert surveillance. Both of these devices are commonly used by law enforcement and intelligence agencies to monitor people or places without their knowledge.