Maybe all that's needed to enter perfection (4,3,6)

I believe the answer is:

just the ticket

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I'm afraid I can't explain this answer.

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

I've seen this clue in The Irish Times.

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