Little Dorothy has a small figure (4)
I believe the answer is:
doll
'figure' is the definition.
(thesaurus)
'little dorothy has a small' is the wordplay.
'little' says to take the initial letters.
'has a small' becomes 'oll' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The first letter of 'dorothy' is 'd'.
'd'+'oll'='DOLL'
Can you help me to learn more?
(Other definitions for doll that I've seen before include "Toy model of person" , "Puppet" , "Figurine" , "Small replica of a person" , "Toy replica of a person" .)