Related Clues:

• Apollo approval
• Straight up or straightened up
• Terrific
• Well-kept
• "Cool!" old-style
• ''Far out!''
• Nifty
• Very good
• NASA thumbs-up
• Straight in a snifter
• 'Way cool!'
• ''Peachy!''
• Fine and dandy
• Undiluted, as whiskey
• Litter-free