Making sense of stuffing uniform top to bottom (6,2)
I believe the answer is:
adding up
'making sense' is the definition.
('add up' can be a synonym of 'make sense')
'stuffing uniform top to bottom' is the wordplay.
'stuffing' becomes 'adding' (I can't justify this - if you can you should give a lot more credence to this answer).
'uniform' becomes 'u' (phonetic alphabet: alpha, bravo, charlie etc.).
'to bottom' says to take the final letters.
The last letter of 'top' is 'p'.
'adding'+'u'+'p'='ADDING UP'
'of' is the link.
(Another definition for adding up that I've seen is " Making sense of".)