Related Clues:

• ___ out (withdraw)
• Show a preference
• Say no, with 'out'
• Elect (to)
• Back (out)
• Check ''yes,'' e.g.
• Pick, with ''for''
• With 30-Down, kind of clause
• Withdraw (with "out")
• ___-in (like some mailing lists)
• Be choosy
• __-out clause
• Pick an alternative
• ___-out clause
• Settle on (with "for")