All you need to travel? Exactly right (4,3,6)
I believe the answer is:
just the ticket
'all you need to travel? exactly' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'right' is the wordplay.
I cannot quite understand how this works, but
'right' could be 'just' (similar in meaning) and 'just' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for just the ticket that I've seen before include "Minimum requirement for one travelling" , "Perfect!" , "Appropriate or desirable thing" , "first class?" , "Exactly what's needed" .)