'Assistant' in the Bible

Then Sanballat sent his assistant to me the fifth time. But this time the letter was sent unsealed, and

I gave instructions that Shelemiah the priest, Zadok the scribe, and a certain Levite named Pedaiah be put in charge of the storerooms, and that Hanan son of Zaccur, the son of Mattaniah, be their assistant, for they were regarded as trustworthy. It was then their responsibility to oversee the distribution to their colleagues.