Possible Clues:

• Traditional institution that's taken in the PM
• Early evening meal, in London
• Airline meal?
• *Late afternoon meal, in Britain
• Meal comprising a hot dish and cakes etc
• Makes a meal of being stoned on half of 4 down
• British afternoon tradition, and what this puzzle's four longest answers literally have?
• Fellow eats scrap, deprived of starter before a meal?
• Afternoon meal that's served by airlines
• Bath custom