Related Clues:

• Frost output
• Pound piece
• "The Raven," e.g.
• Literary composition
• Haiku, for one
• Metrical composition
• Pope's work
• Feature of many a sympathy card
• Limerick, for one
• Hallmark card text, often
• 59-Across, for one
• Pope piece
• Greeting card feature, often
• It has been compared to a tree
• Stressful work?