This person's left something from China, say (6)
I believe the answer is:
import
'something from china say' is the definition.
(something imported from China)
'this person's left' is the wordplay.
'this person's' becomes 'I'm' (('I am' - 'this person' means the crossword setter).
'left' becomes 'port' (left side of a ship - opposite of starboard).
'im'+'port'='IMPORT'
(Other definitions for import that I've seen before include "introduction" , "Bring in goods from abroad" , "introduce" , "Weight" , "Meaning - bring goods into the country" .)