Rome trip arranged for a trader (8)
'a trader' is the definition.
(I've seen this before)
'rome trip arranged' is the wordplay.
'arranged' is an anagram indicator.
'rometrip' is an anagram of 'IMPORTER'.
'for' is the link.
(Other definitions for importer that I've seen before include "One buys in", "One who brings in", "One bringing in goods to country", "Businessperson", "Foreign dealer".)