Less wet (5)
I believe the answer is:
drier
'less wet' is the definition.
('dry' can be the opposite of 'wet' so perhaps 'drier' is reasonable for 'less wet')
This is all the clue.
(Other definitions for drier that I've seen before include "See 1" , "It removes moisture" , "Machine which removes water" , "More arid" , "getting less rainfall" .)