Possible Clues:

• Subdues some of the team-mates?
• Breaks ... or an anagram of the ends of five Across answers in this puzzle
• Renders docile
• Breaks on a ranch
• Breaks, as a stallion
• Breaks, at a ranch
• Takes the wildness out of
• Busts, as a bronco
• Losing height, river gets less fierce
• Domesticates an animal