Possible Clues:

• One who is named for the post
• Intended recipient
• Someone seen by postman looking through a window?
• One likely to have letters to his name
• I may not apply, but I ought to get the post
• The person to whom letter is delivered
• The Sir in 'Dear Sir'?
• A comedian 'espousing' women's clothing -- it's his delivery
• Say further with resolution and observe intended recipient
• The one who should get the post