Related Clues:

• Indulge in quid pro quo
• Type of meet
• Stand-in
• Give this for that
• What black and white squares do on a chessboard
•     Give and take
• Something to haggle over
• Even trade
• Give-and-take
• Meeting point
• Do this, then that, then this again
• Horse-trade
• Make a trade
• Take this for that
• Respond