Crossword Genius

May be handy if you're about to pass out (4)

Ross

I believe the answer is:

door

I'm a little stuck... Click here to teach me more about this clue!

'out' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for door that I've seen before include "See 1" , "Swinging barrier" , "Usual entrance" , "Opener" , "Barrier to open and close" .)

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