The term 'EAVESDROPPER's Device' refers to a device used by an EAVESDROPPER to listen in on conversations without the knowledge of the people involved. The three crossword solutions for this term are TAP (3 letters), WIRETAP (7 letters), and BUG (3 letters). A TAP is a device that connects to a telephone line and records conversations. A WIRETAP is a device that intercepts and records electronic communications, such as phone calls or emails. A BUG is a device that is hidden in a room and records conversations. All of these devices are used by eavesdroppers to secretly record conversations.