Crossword Genius

Place or point of entering or beginning (9)

Ross

I believe the answer is:

threshold

(Other definitions for threshold that I've seen before include "Entrance to house - bride is carried across it" , "Sill of house door" , "Starting point for a new experience" , "The bride may be carried across this door bottom" , "gate" .)

I've seen this clue in the Sydney Morning Herald.
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