Related Clues:

• Culture
• It's tough to break one
• Riding costume
• Some are difficult to break
• Nail-biting, perhaps
• Things that are picked up and kicked
• Regular tendency
• Convent attire
• They may be tough to break
• Gum chewing, for some
• Tough thing to kick
• Religious costume
• Dominant tendency
• Usual practice
• -- -forming