Possible Clues:

• Homer, for example, may be found here, put in class assignment
• Catalog
• Classify; bird’s home
• Postpone
• Messenger facing difficult situation -- will letters arrive here?
• Opening with responsibility for where mail may be left?
• The Messenger has a green feature where you'd normally expect to find individual letters?
• Compartment
• 'Tired and emotional' oenophile given a little grape to classify
• Classify first of grapes embraced by excited oenophile