Greek sort of trance (6)
I believe the answer is:
cretan
'greek' is the definition.
(someone from the Greek island of Crete)
'sort of trance' is the wordplay.
'sort of' indicates an anagram.
'trance' anagrammed gives 'CRETAN'.
(Other definitions for cretan that I've seen before include "One comes from a Mediterranean island" , "One from largest Greek isle" , "Of a Greek island, centre of the Minoan civilisation" , "Native of Minoan island" , "One from Greece's largest island" .)