Related Clues:

• Make illegal
• Secret alternative
• Arrid competitor
• Declare off-limits
• Preclusion
• Secret rival
• Make taboo
• Officially bar from entry
• Stop O.K.'ing
• Legally stop
• Axe competitor
• See 25 Across
• U.N. chief ___ Ki-moon
• No-smoking ordinance, e.g.
• Severe penalty