Possible Clues:

• Weaponized food in a Hitchcock episode
• Meat joint
• Plastic bricks almost set alight with Sunday roast
• Blame golf for spoiling meat joint
• Dish that's left I mostly cook with alcohol
• Roasted entree
• A Sunday roast?
• This 21 across, being perhaps one of 10 across, will be one of 25 down
• The sort of sheepshank that does not get 19 across