Travel papers (5)
I believe the answer is:
visas
'travel papers' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for visas that I've seen before include "They allow bearers to enter a country" , "Passport stamps permitting travel" , "travel permits" , "They allow the bearer to enter a country" , "Travel documents required by some countries" .)