Possible Clues:

• 17 to accompany a German exchange
• Exchange, as an old car
• Denied article being given up in part for this?
• A good deal of French on board coach
• Used car deal
• Dave's outside in coach for deal
• Item given in part payment for a new one
• What you may do with old car of Parisian ploughing into coach
• Exchange as (part) payment for something else
• Sort of deal involved aid with rent