Famous Liverpudlian (6)
I believe the answer is:
lennon
'famous liverpudlian' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for lennon that I've seen before include "John . . . . . ., murdered Beatle" , "Assassinated Beatle" , "old pop star" , "Woman' writer?" , "See 25" .)