Wow female, upper-class, somewhere in Greece (5)
I believe the answer is:
corfu
'somewhere in greece' is the definition.
(Greek island)
'wow female upper-class' is the wordplay.
'wow' becomes 'cor' (both are expressions of surprise).
'female' becomes 'f' (abbreviation).
'upper-class' becomes 'u' (similar in meaning).
'cor'+'f'+'u'='CORFU'
(Other definitions for corfu that I've seen before include "Island off west of Greece, popular for holidays" , "holiday venue!" , "Gk. island, opposite Albania" , "holiday destination?" , "Major holiday island off west coast of Greece" .)