I’m one who carries for international trader (8)
I believe the answer is:
importer
'international trader' is the definition.
'i'm one who carries' is the wordplay.
'one who carries' becomes 'porter'.
'im'+'porter'='IMPORTER'
'for' acts as a link.
(Other definitions for importer that I've seen before include "One who brings in" , "Businessperson" , "Foreign dealer" , "A trader in foreign goods" , "One bringing in goods to country" .)