Possible Clues:

• Reciprocal expression of wonder in flower
• Something amazing in river allowing boats to meet?
• Like most streets to be one more than 25-down?
• Like most roads
• Direction on street sign leads to admiration in long Scottish river
• With 6-Down, mutual relationship
• Success dividing river, permitting passage in opposite directions
• Reciprocal
• Odd characters from town meeting over street heading in opposite directions
• Like many streets or traffic