Youngster brought to a Caribbean island (4)
I believe the answer is:
cuba
'caribbean island' is the definition.
(I've seen this before)
'youngster brought to a' is the wordplay.
'youngster' becomes 'cub' (I've seen this in other clues**).
'brought to' means one lot of letters go next to another.
'cub'+'a'='CUBA'
(Other definitions for cuba that I've seen before include "Largest West Indies island" , "Island nation" , "Guantanamo Bay island" , "Its capital is Havana" , "neighbour to America" .)