Testament of woman, not us (6)
I believe the answer is:
others
'not us' is the definition.
(I've seen this in another clue)
'testament of woman' is the wordplay.
'testament' becomes 'ot'.
'of woman' becomes 'hers' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ot'+'hers'='OTHERS'
Can you help me to learn more?
(Other definitions for others that I've seen before include "Not the same one already mentioned" , "Not these, alternatives" , "Certainly not us" , "People in throes - not us" , "He rots (anag.)" .)