Possible Clues:

• Coaches ... or, with 18-Across, station break?
• Gets ready to compete
• Gets ready to play
• '-- and Boats and Planes', song written by Burt Bacharach and Hal David
• Bridal gown features
• Works out riddle, having succeeded finally
• 57-Down vehicles
• Means of transport for schools
• Head of Thai State rules as a monarch with groups of courtly attendants
• Some have many cars