Possible Clues:

• Potentially enliven beef with Yankee produce, showing no sign of hesitation
• Impregnate with gaseous element atomic no. 8
• Enrich air, perhaps — briefly extend yoga exercises
• Refuel, as red blood cells
• Enrich with gas to breathe
• Enrich, having eye on tax break, with invested grand
• Add element with symbol O
• Treat, as bottled water
• Put gas in - possibly while someone's out