One who minds, tends, or watches something such as a child, a machine, or cattle; a keeper(noun)
A personal bodyguard.(noun)
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Use "minder" in a sentence
"Corey, teaming up with Kate Mayfield, his minder from the Bureau, sets out to track the Lion, figure out what hes up to this time, and, with all the reckless panache of a homicide cop turned loose to play James Bond, save the free world from unspeakable perils."
"It would have been friendly (though probably a little longer) even without the "minder" - it just doesn't make sense to play "gotchya" if you want to learn anything from, or communicate anything to, influence brokers."
"The consultant always gets an in-house minder aka the organization's Project Manager to negotiate admin and, more importantly, internal political issues."