Possible Clues:

• Ready to accept extremely eccentric instructions
• Some keep ice ready, backing cook's instructions
• With 58-Across, conditions likely to lead to catastrophe, or what 16-, 21-, 26-, and 45-Across are ingredients for?
• Cookery instructions
• "Eye of newt and toe of frog" context
• ...comeback of majestic Queen formula
• Instructions namely about parking on open space
• Bon Appétit offering
• Cook's formula
• It calls for things in the kitchen