Make sense of total (3,2)
I believe the answer is:
add up
This clue is a double definition.
'make sense' is the first definition.
('add up' can be a synonym of 'make sense')
'total' is the second definition.
('add up' can be a synonym of 'total')
'of' acts as a link.
(Other definitions for add up that I've seen before include "Reckon" , "Total; make sense" , "Seem to be sensible" , "Point to a reasonable conclusion" , "Do sums" .)