It entitles the bearer to enter (6)
I believe the answer is:
ticket
'it entitles the bearer to enter' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ticket that I've seen before include "Token for admission" , "Tag showing fare or fee" , "Slip showing payment of fee or fare" , "Travel or entry permit" , "Pass - docket" .)