Panto character made to change (4)
I believe the answer is:
dame
'panto character' is the definition.
(I've seen this before)
'made to change' is the wordplay.
'to change' indicates anagramming the letters.
'made' with letters rearranged gives 'DAME'.
(Other definitions for dame that I've seen before include "Peeress" , "Crossdressed panto role" , "Cross-dressing panto character" , "Title of great actresses" , "Comic pantomime role" .)