Dry, parched (4)
I believe the answer is:
arid
I believe this clue is a double definition.
'dry' is the first definition.
(similar in meaning)
'parched' is the second definition.
(I've seen this before)
(Other definitions for arid that I've seen before include "Parched, waterless" , "Dry and unfertile" , "(Of climate) dry" , "Parched with heat" , "Excessively dry" .)