Possible Clues:

• "___ none of your business"
• Ricky Nelson's '___ Late'
• TGIF's 'I'
• ''... ___ how you play the game''
• '___ never too late!'
• It is, condensed
• Favorite word of nitpicky grammarians
• With 40-Across, a chorus line ... or a hint to this puzzle's theme
• '___ party time!'
• '-- a snap!'