Travel document graduate left (8)
I believe the answer is:
passport
'travel document' is the definition.
(I've seen this before)
'graduate left' is the wordplay.
'graduate' becomes 'pass' (pass the exam).
'left' becomes 'port' (left side of a ship - opposite of starboard).
'pass'+'port'='PASSPORT'
(Other definitions for passport that I've seen before include "Travel authorisation" , "that may gain acceptance" , "Travel ID" , "Document facilitating travel" , "Document allowing travel abroad" .)