Related Clues:

• Very tidy
• Without ice, as a drink
• 'Cool beans!'
• Gradually expand
• ''Oh, cool!''
• Well kept up
• Tidily organized
• Sarcastic expression of enthusiasm
• Fantastic, in Beatlemania
• Ship-shape
• 'Super-duper!'
• The -- Four
• Unlike many a dorm room
• Mess-free
• "Keen!"