Crossword Genius

Member of youth organisation on a Caribbean island (4)

Ross

I believe the answer is:

cuba

I'm a little stuck... Click here to teach me more about this clue!

'caribbean island' is the definition.
(I've seen this before)

'member of youth organisation on a' is the wordplay.
'member of youth organisation' becomes 'cub' (I can't justify this - if you can you should believe this answer much more).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'cub'+'a'='CUBA'

Can you help me to learn more?

(Other definitions for cuba that I've seen before include "Island country involved in a 1962 missile crisis" , "Country famous for its cigars" , "Hemingway's stamping-ground" , "Long rum-based drink" , "Caribbean country of cigars and rum?" .)

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