Related Clues:

• Be hesitant
• Obey a sentry
• What things may grind to
• Contender for your title
• Adver-sary
• Go no further
• One of ''Them''
• McCoy, to Hatfield
• No ally
• Come to a standstill
• Sentry's directive
• Mailman, to a canine?
• 'This is a Montague, our ___': 'Romeo and Juliet'
• Drill command
• The Joker, to Batman