Word with stop or prize

DOOR …

Think of what you might open to enter a room or what a game show host might say before revealing what’s behind it.

This clue plays on two common phrases where "door" follows another word. "Stop" can pair with "door" to make "stopdoor" (like in a bus or train), while "prize" hints at "doorprize," a free gift given to event attendees. The answer is simply "DOOR," since it completes both phrases neatly. It’s a clever way to clue a short word by showing its versatility in compound terms.