A diplomat was a being appointed to conduct diplomacy.
Sir Reginald Styles was a British diplomat. (TV: Day of the Daleks)
Andrews was a diplomat during World War II. (AUDIO: The Forsaken)
A Bosnian diplomat was assassinated after signing an agreement with Josie Williams during Operation Endeavour. (HOMEVID: When to Die)
Ixotta was a diplomat tasked to find out information about Peter Summerfield. (AUDIO: The Adolescence of Time)