Less messy
I think it could be either:
'less messy' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for neater that I've seen before include "More tidy and uncluttered" , "More spick and span" , "Tidier" , "Less untidy" , "Less messy" .)
'less messy' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tidier that I've seen before include "more organised" , "More methodical" , "More trim" , "not so disorderly" , "Trigger" .)