Venetian explorer (5,4)
I believe the answer is:
marco polo
'venetian explorer' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for marco polo that I've seen before include "Traveller between 15 dn and 6 dn" , "Venetian adventurer" , "Venetian explorer of China in 13th/14th centuries" , "traveller in East" , "Old travelling salesman" .)