Best replacement (5)
I believe the answer is:
starr
'best replacement' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for starr that I've seen before include "English rock star and drummer, b. 1940" , "Ringo --, drummer" , "Ringo - (The Beatles)" , "Freddie . . . . . Ate My Hamster" , "Beatle Ringo" .)