Related Clues:

• Social one's "gift"
• Tie up the line
• Balloon contents
• Talker's "gift"
• Petrol
• Filling-station supply
• Bombas-tic talk
• 21-Across, for one
• Atmosphere makeup
• Station ration
• Nitrogen, for instance
• Balloon fill
• Swell time
• Yak it up
• Stove fuel