Nero definitely has to destroy (5)
I believe the answer is:
erode
'destroy' is the definition.
(thesaurus)
'nero definitely has' is the wordplay.
'has' says the answer is hidden in the clue.
'ERODE' is hidden within 'nero definitely'.
'to' acts as a link.
(Other definitions for erode that I've seen before include "'Deteriorate, wear away (5)'" , "Corrode" , "Wear away with weather" , "Gradually destroy" , "Gradually wear away" .)