Traveller might have one go left (8)

I believe the answer is:

passport

'traveller might have one' is the definition.

'go left' is the wordplay.
'go' becomes 'pass' (synonyms).
'left' becomes 'port' (left side of a ship - opposite of starboard).
'pass'+'port'='PASSPORT'

(Other definitions for passport that I've seen before include "Document facilitating travel" , "Document allowing travel abroad" , "Document to allow entry to another country" , "Travel ID" , "Travel doc" .)

I've seen this clue in The Telegraph.

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