Someone using a hidden camera or signal jammer

SPY

This person might work undercover for an agency or gather secrets without being detected—think of a classic Bond character.

The clue describes a person secretly gathering information or disrupting communications, which fits the role of a "spy." The mention of a hidden camera or signal jammer hints at covert surveillance or interference—classic spy tactics. "Spy" is a straightforward answer since it directly ties to both espionage tools and the act of operating in secrecy.