How this answer should be written? Completely! (4,3,2,6)
I believe the answer is:
from top to bottom
'completely' is the definition.
(I've seen this in another clue)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for from top to bottom that I've seen before include "throughout? - with 17d" , "As this answer will be written" , "Absolutely" , "unique as this grid entry?" .)