Fab Four name (4)
I believe the answer is:
paul
'fab four name' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for paul that I've seen before include "Some rob Peter to pay .." , "Beatle - singer with Peter and Mary" , "-- Revere, US hero" , "Epistle writer" , "One of the apostles" .)