Celia changes her name (5)
I believe the answer is:
alice
'name' is the definition.
'celia changes her' is the wordplay.
'celia' anagrams to 'ALICE'.
But, I'm not sure how this is indicated.
Can you help me to learn more?
(Other definitions for alice that I've seen before include "Carroll heroine" , "Wonderland heroine" , "Lewis Carroll's heroine" , "Miss Liddell" , "A Town Like - - (novel/film)" .)