Islander's copper prohibition (5)

I believe the answer is:

cuban

'islander's' is the definition.
(I've seen this before)

'copper prohibition' is the wordplay.
'copper' becomes 'cu' (chemical symbol).
'prohibition' becomes 'ban' (synonyms).
'cu'+'ban'='CUBAN'

(Other definitions for cuban that I've seen before include "Like Fidel Castro" , "Citizen of Castro's country" , "Kind of high quality cigar" , "Havana native" , "Republican" .)

I've seen this clue in The Guardian.

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