Crossword Genius

Exactly what's needed, and all that's needed, to get on board (4,3,6)

Ross

I believe the answer is:

just the ticket

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'exactly what's needed' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for just the ticket that I've seen before include "Appropriate or desirable thing" , "Minimum requirement for one travelling" , "first class?" , "Perfect!" , "Exactly what's needed" .)

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