Related Clues:

• See 17-Across
• Poetic time of day
• Early part of the day
• Literary time of day
• Poetic period
• 'September ___' (Neil Diamond hit)
• Poet's time of day
• Even's opposite
• Early time
• The dawn, to Keats
• Dawn, poetically
• Break of day
• Eve's counterpart
• Time starting at dawn
• In 'Hamlet,' it's 'in russet mantle clad'