Related Clues:

• 'Love thy neighbor' is one
• Out of style
• Trite saying
• Old hat
• Accepted rule
• Saw
• Antiquated
• It goes without saying
• See 16-Across
• Old
• 'Too many cooks spoil the broth,' e.g.
• Of the old school
• 'If it ain't broke, don't fix it,' e.g.
• 'Waste not, want not,' e.g.
• Saying