Possible Clues:

• Measuring devices (often old?)
• Some meet officials
• Oven components
• Track officials
• Speed-chess accessories
• Cooking aids
• Looking back, school to send money back presumably for school bells
• They go off at the start of 4 across for final school run
• Start 18 across with recipe for the last of the vegetables, as they?re bound to go off
• Microwave functions