Suicide in Aeneid accomplished nothing (4)
I believe the answer is:
dido
'suicide in aeneid' is the definition.
(I know that Dido is a person who committed suicide)
'accomplished nothing' is the wordplay.
'accomplished' becomes 'did' (to do something is to accomplish it).
'nothing' becomes 'O' (looks like zero - 0).
'did'+'o'='DIDO'
(Other definitions for dido that I've seen before include "Antic" , "Former queen of Carthage" , "Carthaginian heroine" , "Classical suicide" , "In Roman mythology, she committed suicide when abandoned by Aeneas" .)