Verse in Hesiod explained (3)
I believe the answer is:
ode
'verse' is the definition.
(I've seen this in another clue)
'in hesiod explained' is the wordplay.
'in' says the answer is hidden in the clue.
'ODE' is hidden within 'hesiod explained'.
(Other definitions for ode that I've seen before include "Verse form" , "A poem celebrating person or event" , "Sung poem" , "Poem expressing noble feelings" , "(Railway)system" .)