Crossword Genius

Is one put out when shown it? (4)

Ross

I believe the answer is:

door

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for door that I've seen before include "Entry point" , "Swinging barrier" , "Moveable structure at an entrance" , "place of entry" , "Entrance barrier" .)

I've seen this clue in the Evening Standard.
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