Crossword Genius

Opening for cake, when leaving Australia (4)

Ross

I believe the answer is:

gate

'opening' is the definition.
(I have seen 'Movable opening ' mean 'gate' so perhaps 'opening' could also mean 'gate')

I don't understand how the rest of the clue works.

(Other definitions for gate that I've seen before include "Hinged barrier in an entrance" , "Punish student" , "Airport boarding point" , "Facility in airport" , "Plane-boarding point" .)

I've seen this clue in The Guardian.
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