Earth reduced to dust? (6)
I believe the answer is:
ground
I believe this clue is a double definition.
'earth' is the first definition.
(I know that earth is a kind of ground)
'reduced to dust?' is the second definition.
(I've seen this before)
(Other definitions for ground that I've seen before include "Stop (a pilot) flying" , "foundation course?" , "reduced to dust" , "turned to dust" , "Earth; crushed to powder" .)