Big Mac meal with a Coke, e.g.

ORDER

Think of what you tell the cashier when you're ready to pay for your food, especially when you've picked everything from the menu. It starts with a vowel and rhymes with "border."

This clue plays on the idea of a "Big Mac meal with a Coke" as something you’d request at a fast-food restaurant. The word "order" fits because it means both a command (like placing a request) and a sequence (like a combo meal). The "e.g." hints that this is just one example of an order, keeping the answer broad. It’s a straightforward definition with a real-world scenario to nudge the solver.