"The door's open!" (5)

I think it could be either:

Which length description are you looking for?:

enter

'the door's open' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for enter that I've seen before include "Set foot in" , "put in for a race" , "Move into" , "Enrol" , "Come/go in" .)

I've seen this clue in the LA Times, The New York Times and the USA Today.

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