Related Clues:

• Traffic
• Lifework
• Ball club deal
• Sports deal
• Economic lifeblood
• Tit for tat
• See 67-Across
• Kind of secret
• Give and take
• 'Hold on'
• The 't' in Nafta
• Carpentry or masonry, e.g.
• Exchange
• Swap players or baseball cards
• Be active on Wall St.