Answer points about origin of extremely discriminatory people (7)

'discriminatory people' is the definition.
The definition suggests a plural noun which matches the answer.

'answer points about origin of extremely' is the wordplay.
'answer' becomes 'a' (abbreviation eg in Q and A).
'points' becomes 'gists' (I can't explain this - if you can you should give a lot more credence to this answer).
'about' indicates putting letters inside.
'origin of' says to take the initial letters.
The initial letter of 'extremely' is 'e'.
'gists' going around 'e' is 'geists'.
'a'+'geists'='AGEISTS'

Can you help me to learn more?