Little Dorothy makes point (3)
I believe the answer is:
dot
I believe this clue is a double definition.
'little dorothy' is the first definition.
(nickname for Dorothy)
'point' is the second definition.
(I know that dot is a class)
'makes' is the link.
(Other definitions for dot that I've seen before include "Speck or period" , "Speck; dowry" , "Small round spot" , "Internet punctuation mark" , "Cotton, say" .)