The blighter lied wickedly about Victor (5)
I believe the answer is:
devil
'the blighter' is the definition.
(thesaurus)
'lied wickedly about victor' is the wordplay.
'wickedly' indicates an anagram.
'about' means one lot of letters goes inside another.
'victor' becomes 'v' (phonetic alphabet: alpha, bravo, charlie etc.).
'lied' with letters rearranged gives 'deil'.
'deil' enclosing 'v' is 'DEVIL'.
(Other definitions for devil that I've seen before include "Beelzebub, Satan" , "Demon" , "Lived with Satan" , "Unsurpassed" , "Terror" .)