Rascal lived badly (5)
I believe the answer is:
devil
'rascal' is the definition.
(I've seen this in another clue)
'lived badly' is the wordplay.
'badly' indicates anagramming the letters (letters in the wrong order).
'lived' is an anagram of 'DEVIL'.
(Other definitions for devil that I've seen before include "Archfiend" , "Lived with Satan" , "Old Nick, Satan" , "Wicked spirit" , "Beast" .)