Related Clues:

• Design by leading pair of architects for flat
• Set up American on third horse on the flat
• First choice of schemes
• It has a backup
• Strategy to try first
• Backup preceder
• Flat, as revealed by map, overlooking a river
• The first thing to try (and hope for the best)
• What's tried first
• Develop plot beside a river flat
• Relating to a flat surface
• Flat, geometrically
• Primary procedure
• First line of attack
• Design upset person painting flat