Less than completely stylish character in Athens (3)
I believe the answer is:
chi
'character in athens' is the definition.
'chi' can be an answer for 'character' (chi is a kind of letter of the alphabet). I'm not certain of the 'in athens' bit.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for chi that I've seen before include "character from Euripides?" , "Greek letter; force in Chinese philosophy" , "The 22nd letter of Greek alphabet" , "T'ai -, martial art" , "Greek X" .)