Hero destroyed lido (4)
I believe the answer is:
idol
'hero' is the definition.
(I've seen this in another clue)
'destroyed lido' is the wordplay.
'destroyed' indicates anagramming the letters.
'lido' is an anagram of '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" .)