Rush around Athens? (6)
I believe the answer is:
hasten
'rush' is the definition.
('hasten' can be a synonym of 'rush')
'around athens?' is the wordplay.
'around' indicates anagramming the letters.
'athens' is an anagram of 'HASTEN'.
(Other definitions for hasten that I've seen before include "race? - with 26a" , "Move quickly" , "Be quick to do something" , "Rush" , "Athens (anag.)" .)