Add up an incomplete total (3)
I believe the answer is:
tot
This might be a double definition.
'add up' is the first definition.
('tot' can be a synonym of 'add up')
'an incomplete total' is the second definition.
'tot' can be an answer for 'total' (thesaurus). I'm not sure about the 'an incomplete' bit.
Can you help me to learn more?
(Other definitions for tot that I've seen before include "Small amount of spirits" , "Calculate" , "Add up for baby" , "Get the sum for the child" , "Nip" .)