An agent or attorney.
A tax collector.
The governor of a small imperial province.
A legal officer who both investigates and prosecutes crimes, found in some inquisitorial legal systems, particularly communist or formerly communist states – see public procurator
A performer who understudies; a standby.
To act as an understudy (to someone).
To study or know a role to such an extent as to be able to replace the normal performer when required.
To act in a similar manner to some known person.