Lied about doing nothing (4)
I believe the answer is:
idle
'lied about doing nothing' is the definition.
(I've seen this before)
'lied about' is the wordplay.
'about' indicates anagramming the letters.
'lied' is an anagram of 'IDLE'.
(Other definitions for idle that I've seen before include "Tick over like engine" , "Member of comedy team" , "Still" , "Reluctant to work - Pythonesque Eric" , "Ineffectual" .)