Don't need letters arranged from top to bottom (3-2-3)
I believe the answer is:
end-to-end
'arranged from top to bottom' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'don't need letters' is the wordplay.
'letters' indicates anagramming the letters.
'dont'+'need'='dontneed'
'dontneed' with letters rearranged gives 'END-TO-END'.
Can you help me to learn more?
(Other definitions for end-to-end that I've seen before include "Needn't do (anag.)" , "in a continuous sequence" , "From start to finish" , "As things are laid to give impression of distance" .)