Total? Not total, we hear (3)
I believe the answer is:
sum
'total?' is the definition.
(I know that total can be written as sum)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for sum that I've seen before include "Amount, of money say" , "See 25" , "Arithmetic calculation" , "Quantity of money" , "Quantity obtained by addition" .)