Possible Clues:

• A writer - heartless rogue, and stout
• About to have a drink with the purveyor of the tidings
• Bearer of news about the comic relief in Macbeth?
• Dealing with stout journalist
• One writing in newspaper on drink
• Newspaperman
• Clark Kent's job
• Dos one work about the paper or about the Guinness?
• One may write a column about drink
• Journalist wants a half of real ale