Bone-dry (4)
I believe the answer is:
arid
'bone-dry' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for arid that I've seen before include "Dry raid" , "Wadi may be this" , "Dry, devoid of interest" , "(Of land) very dry" , "Dry and infertile" .)