Crossword Genius

The Rubicon (5,2,2,6)

Ross

I believe the answer is:

point of no return

'the rubicon' is the definition.
('point of no return' can be a synonym of 'rubicon')

This is all the clue.

(Other definitions for point of no return that I've seen before include "after which one's committed?" , "After which one can't go back" , "Crucial moment" , "ace played?" .)

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