Crossword Genius

One coming to a stop at the entrance? (4)

Ross

I believe the answer is:

door

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'the entrance?' is the definition.
(door is a kind of entrance)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for door that I've seen before include "Swinging barrier" , "place of entry" , "Portal" , "Entrance way" , "Entry point" .)

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