Figure, after 'ditto', to get a duplication (4)
I believe the answer is:
doll
'figure' is the definition.
(thesaurus)
'after ditto to get a duplication' is the wordplay.
'after' means one lot of letters go next to another.
'ditto' becomes 'do'.
'to get a duplication' becomes 'll' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'do' put next to 'll' is 'DOLL'.
Can you help me to learn more?
(Other definitions for doll that I've seen before include "A girl's plaything" , "Girl's toy" , "Toy replica of a person" , "Toy representing person" , "Small replica of a person" .)