Possible Clues:

• Quantity of brownies
• A number of things produced at the same time
• Group about to invade spa city
• Group in club meeting honoured companion
• Group of items (as handled)
• Prolific scorer, having extra time a lot
• Baker's dozen, say
• One lot of a hundred in there having a wash
• All the bread baked at the same time
• Set of items produced at the same time