Hero destroyed lido (4)
I believe the answer is:
idol
'hero' is the definition.
(thesaurus)
'destroyed lido' is the wordplay.
'destroyed' is an anagram indicator.
'lido' with letters rearranged gives 'IDOL'.
(Other definitions for idol that I've seen before include "Admired figure" , "pop star" , "Object of excessive adoration" , "Hero of screen or stage" , "Billy" .)