Possible Clues:

• Secretary uses one name, Susan, for disguise
• Chap employed in producing an issue?
• If he starts to be a secretary, you, a headless fowl and his little sister will finish it
• Literary assistant usually employed to take dictation and make copies of manuscripts
• Helper who takes dictation
• Literary assistant - scribe
• A fellow with business essentially in scribbling?
• A bloke edited new issue, getting secretarial help
• Literary assistant a guy uses in ... in error
• Dictator's assistant with a man makes one in France take on little sister