Mame changes her name (4)
I believe the answer is:
emma
'her name' is the definition.
'mame changes' is the wordplay.
'changes' is an anagram indicator.
'mame' with letters rearranged gives 'EMMA'.
(Other definitions for emma that I've seen before include "young woman in novel" , "classic work" , "Austen character" , "Jane Austen work - Ms Bunton, former Baby Spice" , "J Austen novel" .)