A mother, with last son, butchered the women warriors of Scythia (7)
I believe the answer is:
amazons
'the women warriors of scythia' is the definition.
I can't tell whether this defines the answer.
'a mother with last son butchered' is the wordplay.
'mother' becomes 'ma' (ma can mean mother).
'with last' becomes 'z' (I can't explain this - if you can you should believe this answer much more).
'butchered' indicates an anagram (I've seen this in other clues).
'son' with letters rearranged gives 'ons'.
'a'+'ma'+'z'+'ons'='AMAZONS'
Can you help me to learn more?
(Other definitions for amazons that I've seen before include "Legendary female warriors" , "Mythical female warriors of Scythia" , "Women warriors" .)