Greek coasters in a storm (8)
I believe the answer is:
socrates
'greek' is the definition.
(I know that Socrates is a Athenian)
'coasters in a storm' is the wordplay.
'in a storm' indicates anagramming the letters.
'coasters' is an anagram of 'SOCRATES'.
(Other definitions for socrates that I've seen before include "Plato's mentor" , "Coarsest (anag) - philosopher" , "Wise guy" , "Man philosophically questioning" , "Hemlocked philosopher" .)