Columbus discovery of 1493
I believe the answer is:
antigua
'columbus discovery of 1493' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for antigua that I've seen before include "former British possession" , "West Indies island" , "Largest of Leeward Is." , "Aga unit in the West Indies" , "One of the Leeward Islands" .)