Related Clues:

• Not peripheral
• Chief; pipe
• Primary pipe
• Type of street, attraction or event
• Most important — sail
• Street name in practically every city
• Major tributary of the Rhine, flowing through Frankfurt
• Word before "event" or "course"
• Principal supplier of gas or water
• Small-town parade street
• Common downtown street
• Principal pipe for conveying gas
• Principal Rhine city, not unknown
• ___ drag
• Important water pipe