Dry, as a desert (4)
I believe the answer is:
arid
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dry as a desert</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for arid that I've seen before include "Extremely dry" , "(Of land) very dry" , "Dry and unfertile" , "Parched and barren" , "Dry raid" .)