Quadratics and such (7)
I believe the answer is:
algebra
'quadratics and such' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for algebra that I've seen before include "branch of learning" , "for study in class" , "Numbers and letters branch of maths" , "letters here set out the problem" , "Boolean speciality is raised" .)