Related Clues:

• Zealot
• High-grade
• Experts
• 'All systems go!'
• Sound beginning?
• 'All systems go'
• High fliers
• Cards up one's sleeve?
• Just ducky
• Swell
• Top parts of suits
• Thumbs-up response
• Marvelous, in slang
• Ones that may be high?
• Second to none