Related Clues:

• Bills, circulars, etc.
• Jousting gear
• Post office sackful
• Weekday delivery
• It may be junk
• It often contains lots of letters
• Knight clothes
• It might be four letters
• "You've got __"
• Gladiator's defense
• Vacationer's accumulation
• Galahad's protection
• Knight's gear
• Knight's cover
• Drop in a letter box