Two girls are the making of another (8)
I believe the answer is:
rosemary
'two' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'girls are the making of another' is the wordplay.
I cannot quite understand how this works, but
'are' could be 'a' (short for 'are', historical unit of measurement) and 'a' is found within the answer.
'of' could be 'o' and 'o' is found within the answer.
'another' could be 'r' (I've seen this in other clues) and 'r' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for rosemary that I've seen before include "such seasons" , "Plant" , "Aromatic shrub" , "Herb - girl's name" , "Evergreen flowering shrub - girl's name" .)