One followed by a goddess (6)
I believe the answer is:
athena
'goddess' is the definition.
(I've seen this before)
'one followed by a' is the wordplay.
'one' becomes 'a'.
'followed by' becomes 'then'.
'a'+'then'+'a'='ATHENA'
(Other definitions for athena that I've seen before include "Greek goddess of wisdom etc." , "One-time goddess" , "wise but fierce goddess" , "Greek goddess of a capital city" .)