Sum, aggregate (5)
I believe the answer is:
total
This clue is a double definition.
'sum' is the first definition.
(I know that sum can be written as total)
'aggregate' is the second definition.
(I know that aggregate can be written as total)
(Other definitions for total that I've seen before include "given by 8 [ADDING MACHINES]" , "energy provider" , "Completely destroy" , "Whole amount" , "Entirety" .)