Artist lived a lie, in part (4)
I believe the answer is:
dali
'artist' is the definition.
(I've seen this before)
'lived a lie in part' is the wordplay.
'in part' says the answer is hidden in the clue.
'DALI' is hidden within 'lived a lie'.
(Other definitions for dali that I've seen before include "Salvador -, twentieth century artist" , "Surrealist Spanish painter, d. 1989" , "Tree" , "Salvador --, twentieth century Spanish surrealist painter" , "Salvador . . . . was great Spanish surrealist painter" .)