Possible Clues:

• Bottles with stoppers, for serving wine or water
• 'Slows to a trot, perhaps, when there's drink in them (9)'
• Vessels for serving wine or water
• This slows the horses down when there's drink in them
• So as to hold one's drink, one slows up, it would seem
• Tin is off-putting: take round glass containers
• Wine is poured into these for use at table
• Is discouraging about tin containers for wine
• Ardent sec provides wine flasks for table
• The wine bottles have sad centre, oddly