minder

noun4

1. •
   One who minds, tends, or watches something such as a child, a machine, or cattle; a keeper.
2. •
   (UK) A personal bodyguard.
3. •
   A monitor assigned by the authorities to someone, such as a foreign visitor (to exercise control over their contacts with the populace) or a journalist or someone who is speaking to journalists (to monitor and control what they say).

   • The twenty-eight journalists who sailed with the task force were accompanied by seven censors or 'minders' from the MoD, as well as by military press officers attached to each unit. — 1982
4. •
   (no longer used) One who is taken care of, such as a pauper child in the care of private person; a ward.