Person beyond help — individual in Greece (5)
I believe the answer is:
goner
'person beyond help' is the definition.
(I've seen this before)
'individual in greece' is the wordplay.
'individual' becomes 'one' (an individual is one person).
'in' is an insertion indicator.
'greece' becomes 'Gr' (abbreviation).
'one' going inside 'gr' is 'GONER'.
(Other definitions for goner that I've seen before include "Hopeless case" , "Person beyond saving" , "Nasty princess" , "Someone beyond any hope of recovery" , "One who can't be saved" .)