Neat sort of sum? (4)
I believe the answer is:
tidy
'neat' is the definition.
(synonyms)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for tidy that I've seen before include "Neat and orderly" , "Neat, ordered" , "In apple-pie order" , "Arranged neatly" , "Neaten" .)