Related Clues:

• Lake Nasser supplier
• Sour fruit
• Tom Collins ingredient
• 7-Up ingredient
• See 90-Across
• Key pie ingredient?
• Type of nut
• Waterway in a Christie title
• Drab color?
• Cairo waterway
• Christie setting
• Blue preceder or follower
• Cleopatra's river
• Ade flavor
• Aswan Dam river