White Rabbit's pursuer (5)
I believe the answer is:
alice
'white rabbit's pursuer' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for alice that I've seen before include "Immortal girl in Wonderland" , "Celia (anag.)" , "Adventurous girl created by Lewis Carroll" , "Lewis Carroll's immortal girl" , "Celia changes into a different girl" .)