Youngster reaches a part of the Caribbean (4)
I believe the answer is:
cuba
'part of the caribbean' is the definition.
(I know that Cuba is part of Caribbean)
'youngster reaches a' is the wordplay.
I cannot really see how this works, but
'youngster' could be 'cub' (cub can mean a young person) and 'cub' is found within the answer.
'a' is within the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for cuba that I've seen before include "tropical country" , "Long rum-based drink" , "Island nation" , "Island N. of Jamaica" , "Castro's country" .)