Cattle without water (4)
I believe the answer is:
This clue is a double definition.
'cattle' is the first definition.
(I've seen this before)
'without water' is the second definition.
(I've seen this in another clue)
(Other definitions for neat that I've seen before include "Very good American" , "Spick and span" , "Bovine animal" , "Cool - without a mixer" , "Tidy, well-ordered" .)