Explorer Amerigo (8)
I believe the answer is:
vespucci
'explorer amerigo' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for vespucci that I've seen before include "Amerigo -, fifteenth to sixteenth century explorer" , "America is called after the Florentine navigator" , "Amerigo ___, navigator after whom America was named?" , "America was named after this explorer" , "Amerigo - - , Florentine explorer" .)