legman

noun, plural leg·men [leg-men, -muh n] /ˈlɛgˌmɛn, -mən/.

1. a person employed to transact business outside an office, especially on behalf of one whose responsibilities require his or her presence in the office.
2. Journalism. a reporter who gathers information by visiting news sources or by being present at news events.

noun plural -men mainly US and Canadian

1. a newsman who reports on news stories from the scene of action or original source
2. a person employed to run errands, collect information, etc, outside an office