Leader in Caribbean, a revolutionary sort (6)
I believe the answer is:
castro
'leader' is the definition.
(I have seen 'Cuban leader' mean 'castro' so perhaps 'leader' could also mean 'castro')
'caribbean a revolutionary sort' is the wordplay.
'caribbean' becomes 'c' (this could be a standard abbreviation which I don't know about).
'revolutionary' indicates anagramming the letters.
'sort' is an anagram of 'stro'.
'c'+'a'+'stro'='CASTRO'
'in' is the link.
Can you help me to learn more?
(Other definitions for castro that I've seen before include "Fidel -, former Cuban leader" , "He's late" , "Cuban dictator" , "Fidel ......, Cuban chief" , "revolutionary leader" .)