Possible Clues:

• What holds back stock song included by La Traviata's leads
• Ring in a rodeo ring
• A trail (anag) — rope
• A trial settlement is gripping for nag, for instance, on the run perhaps
• Long narrow ditch
• Roundup accessory
• The French king in Cork gets a time for hanging around the horses
• Noosed rope
• Circle of cowpokes?
• Noosed rope for catching animals