Raid carried out without water (4)
I believe the answer is:
'without water' is the definition.
(I've seen this before)
'raid carried out' is the wordplay.
'raid' can be anagrammed to 'ARID'.
But, I am not clear how the anagram is indicated.
Can you help me to learn more?
(Other definitions for arid that I've seen before include "Dry and withered" , "(Of an area) very dry" , "Drought-hit" , "Very dry, having little rain" , "Dry, devoid of interest" .)