Some Cuban is happy in exile (6)
I believe the answer is:
banish
'exile' is the definition.
(I've seen this in another clue)
'some cuban is happy' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'BANISH' is hidden in the letters of 'cuban is happy'.
'in' acts as a link.
(Other definitions for banish that I've seen before include "Send (someone) away" , "dislodge" , "Exile in ash-bin" , "Condemn to exile" , "Cast out, ostracize" .)