Related Clues:

• Rigid principles for the running of public transport
• Social circles
• Nails down, as a date
• Bands' playlists
• Puts dishes on
• Arranges, as sails
• Stand-up performances
• Backs bank's stocks and shares in places
• Groups of tennis games
• Goes down, as the sun on the horizon
• Parts of a tennis match
• Puts in position
• Collectors collect them
• Studio's sound stages
• Preceders of spikes, in volleyball