Copper embargo for islander? (5)
I believe the answer is:
cuban
'islander?' is the definition.
(I've seen this before)
'copper embargo' is the wordplay.
'copper' becomes 'Cu' (Cu is the chemical symbol for copper).
'embargo' becomes 'ban' (a ban on trade).
'cu'+'ban'='CUBAN'
'for' acts as a link.
(Other definitions for cuban that I've seen before include "Like Fidel Castro" , "Kind of high quality cigar" , "Caribbean" , "from island republic" , "islander" .)