Part of Greece has style that's unusual (8)
I believe the answer is:
thessaly
'part of greece' is the definition.
('Thessaly' is part of 'greece')
'has style that's unusual' is the wordplay.
'that's unusual' indicates an anagram.
'has'+'style'='hasstyle'
'hasstyle' anagrammed gives 'THESSALY'.
(Other definitions for thessaly that I've seen before include "In Greece a plain" , "Greek region" , "area of Greece" , "Region of central Greece" , "Aegean area" .)