Just the thing for the traveller! (6)

I believe the answer is:

ticket

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'just the thing' is the definition.
(I've seen this before)

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

(Other definitions for ticket that I've seen before include "Token for entry" , "Pass or permit" , "Authorisation for travel, theatre etc" , "needed for train journey" , "It entitles the bearer, to enter perhaps" .)

I've seen this clue in The Sun.

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