Possible Clues:

• Speak with clarity, but then make a joint!
• Well-constructed vehicle, an Australian van, seen around American city
• Express of distinct parts
• Clear and fluent in speech
• Endlessly fastidious, note, and well-spoken
• Clear in speech
• Express in sections jointed together
• Lucid state
• Enter My Silence song about speaking well?
• A tacit rule that's broken, say