Crossword Genius

Important document graduate left (8)

Ross

I believe the answer is:

passport

I'm a little stuck... Click here to teach me more about this clue!

'important document' is the definition.
'passport' can be an answer for 'document' (passport is a kind of document). I'm unsure of the 'important' bit.

'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'

Can you help me to learn more?

(Other definitions for passport that I've seen before include "Official document required for foreign travel" , "Official document required for international travel" , "you might need Visa with this" , "Document facilitating travel" , "Traveller's ID" .)

I've seen this clue in The Sun.
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