Crossword Genius

Atmosphere terribly arid during attack (3,4)

Ross

I believe the answer is:

air raid

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But I can't explain it at all! Could you help me understand?

(Other definitions for air raid that I've seen before include "Attack flying" , "Aerial bomb attack" , "Blitz" , "Attack by hostile aircraft" , "Bombing attack" .)

I've seen this clue in The Mirror.
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