Some Cuban is hopeless in exile (6)
I believe the answer is:
banish
'exile' is the definition.
(to banish is to exile or cast out)
'some cuban is hopeless' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'BANISH' is hidden in the letters of 'cuban is hopeless'.
'in' is the link.
(Other definitions for banish that I've seen before include "Throw out" , "Send away (as punishment)" , "dislodge" , "Drive away, maybe from country" , "Expel from a community or group" .)