Clean without water (4)
I believe the answer is:
neat
I believe this is a double definition.
'clean' is the first definition.
('neat' can be similar in meaning to 'clean')
'without water' is the second definition.
(I've seen this before)
(Other definitions for neat that I've seen before include "Very good American" , "beef" , "farm animals" , "Clever" , "Bovine animal" .)