Born with ancient Greek accent (6)
I believe the answer is:
brogue
'accent' is the definition.
(I've seen this before)
'born with ancient greek' is the wordplay.
'born' becomes 'b'.
'with' says to put letters next to each other.
'ancient greek' becomes 'rogue' ('greek' is an old slang term for a rogue or rascal).
'b'+'rogue'='BROGUE'
(Other definitions for brogue that I've seen before include "Lilting Irish accent" , "Stout shoe - Irish accent" , "Oxford" , "Outdoor shoe; accent" , "Strong outdoor shoe" .)