Nectar prepared for an islander (6)
I believe the answer is:
cretan
'for an islander' is the definition.
(someone from Crete)
'nectar prepared' is the wordplay.
'prepared' indicates an anagram.
'nectar' is an anagram of 'CRETAN'.
(Other definitions for cretan that I've seen before include "A Mediterranean islander" , "One from Greece's largest island" , "Native of Greek island south of mainland (6)" , "One comes from a Mediterranean island" , "Native of a large Greek island" .)