Crossword Genius

No more than travel permit? That's exactly what's needed! (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" , "Exactly what's needed" , "first class?" , "Perfect!" .)

I've seen this clue in The Times.
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