deep throat (noun) informant/informer: person who delivers news
Sinonime: artful, articulate, easy, eloquent, facile, fast-talking, flip*, fluent, garrulous, hot-air, insincere, loquacious, plausible, quick*, ready, silver-tongued,
slick*, slippery*, smooth operator, smooth-spoken, suave, talkative, urbane, vocal, vocative, voluble