That infernal poet! (5)
I believe the answer is:
dante
'that infernal poet' is the definition.
(Dante Alighieri, poet who wrote Inferno)
This is all the clue.
(Other definitions for dante that I've seen before include "Italian poet, writer of the Divine Comedy" , "22 [FT SETTER]" , "Great Italian poet of 'The Divine Comedy'" , "Thirteenth-fourteenth century Italian poet" , "Finally stand before" .)